Reducing aflatoxins in Kenya’s food chains: Filmed highlights from an ILRI media briefing

Last month (14 Nov 2013), the International Livestock Research Institute (ILRI) held a roundtable briefing/discussion for science journalists in Nairobi to highlight on-going multi-institutional efforts to combat aflatoxins in the food chains of Kenya.

Aflatoxins are a naturally occurring carcinogenic by-product of common fungi that grow on grains and other food crops, particularly maize and groundnuts. Researchers from across East Africa are joining up efforts to address the significant human and animal health challenges posed by these food toxins in the region.

Watch this 6-minute film, which highlights some of the interventions being used to tackle aflatoxins in Kenya. The film features interviews with the five panelists at the media briefing, who came from the University of Nairobi, the US Centers for Disease Control and Prevention (CDC) in Kenya, the International Institute of Tropical Agriculture (IITA), the Biosciences eastern and central Africa (BecA)-ILRI Hub, and ILRI.

‘Even though the presence of aflatoxins in Kenya dates back to the 1960s, the first recorded outbreak of aflatoxins that affected humans was recorded in the early 1980s,’ says Erastus Kang’ethe, a professor in the Department of Public Health at the University of Nairobi.

‘The biggest risk of aflatoxins comes from long-term exposure to these toxins, which leads to chronic aflatoxicosis,’ says Abigael Obura, of CDC. ‘The CDC in Kenya is working closely with the Ministry of Health to improve aflatoxin surveillance measures in Kenya’s districts through better sample collection and analysis.’

At the same time, Johanna Lindahl and other scientists at ILRI are assessing the risks posed by aflatoxins in Kenya’s dairy value chain; cows that consume aflatoxin-contaminated feeds produce milk that is also contaminated with the toxins.

According to Charity Mutegi, from the International Institute of Tropical Agriculture, one of the key strategies in managing aflatoxins in Kenya is by using a ‘biological control technology that targets the fungus that produces the aflatoxins while the crop is still in the field.’ Known more popularly as ‘aflasafe,’ this technology, which is expected to be available in the country soon, is in use in other parts of Africa where ‘farm trials have yielded aflatoxin reduction of over 70 percent,’ says Mutegi.

Jagger Harvey, a scientist with the BecA-ILRI Hub, says the hub has established a capacity building platform for aflatoxin research that is being used by maize breeders from Kenya and Tanzania to, among other control efforts, come up with maize varieties that are more resistance to the aflatoxin-causing fungus.

Read a related ILRI news article about a filmed interview of two scientists leading work of the CGIAR Research Program on Agriculture for Nutrition and Health, Delia Grace, of ILRI, and John McDermott, of the International Food Policy Research Institute, who describe some of the risks aflatoxins pose, new options for their better control and why research to combat these toxins matters so much.

View an ILRI infographic of the impact of aflatoxins in the food chain.

Read more on biological control to reduce aflatoxins.

Read more on strengthening regional research capacity to deal with aflatoxins.

World’s largest agricultural research partnership, serving 1 billion poor, marks $1 billion funding milestone–CGIAR

Tanzanian Maasai helping to treat cattle against East Coast fever

Tanzanian Maasai help vaccinate their calves against lethal East Coast fever (photo credit: ILRI/Stevie Mann).

CGIAR has doubled its funding in the last five years, from $500 million (in 2008) to $1 billion (in 2013).

Officials say harvesting the fruits of this historic commitment could, among other benefits, lift 150 million people in Asia out of poverty by boosting rice production, provide 12 million African households with sustainable irrigation, save 1.7 million hectares of forest from destruction, give 50 million poor people access to highly nutritious food crops, and save up to 1 million cattle from dying untimely deaths each year due to a lethal disease.

The International Livestock Research Institute (ILRI) is one of 15 global research centres belonging to CGIAR, which works with hundreds of partners to develop innovative solutions, tools, and technologies for the benefit of the world’s poorest people. It seeks to bring cutting edge science to bear on a wide range of issues facing millions of farmers and other poor smallholders in developing countries who collectively generate nearly 70 percent of the world’s food production.

‘The $1 billion in funding will help finance CGIAR’s 16 global research programs and accelerate the development of scientific, policy and technological advances needed to overcome complex challenges—such as climate change, water scarcity, land degradation, and chronic malnutrition, greatly improving the well-being of millions of poor families across the developing world’, said Frank Rijsberman, CEO of the CGIAR Consortium.

For more than 40 years, CGIAR and its partners have transformed the lives of hundreds of millions of people with the tangible outcomes of agriculture research, including improved crop varieties, sustainable farming methods, new fish strains, novel livestock vaccines, climate-smart solutions, and incisive policy analysis.

For example:

In eastern Africa, a ‘live’ vaccine against the deadly cattle disease East Coast fever developed by ILRI with the Kenya Agricultural Research Institute and other partners and now being distributed by GALVmed, has saved 620,000 calves, benefiting up to 50,000 poor households that rely on cattle for food and income. The vaccine could benefit 20 million more people in the region, with annual benefits of $270 million.

  • Drought tolerant maize has increased farmers’ yields by 20-30%, benefiting 20 million people in 13 African countries.
  • ‘Scuba rice’, which can survive under water for two weeks, is protecting the harvests, incomes, and food security of poor farmers and consumers across monsoon Asia.
  • Newly developed potato varieties that withstand late blight disease and yielded eight times more than native varieties in the region have made the difference between having enough to eat or not in the Paucartambo province of Peru, where late blight threatened to devastate staple food supplies.
  • By integrating food crops with trees that draw nitrogen from the air and transfer it to the soil, an innovative agroforestry practice captures carbon and reduces greenhouse gas emissions, while improving soil fertility, rainwater use efficiency, and yields by up to 400% for maize in the Sahel region.
  • Across Afghanistan, Bangladesh, Ethiopia, Egypt, Nepal, and Pakistan, high-yielding wheat varieties resistant to Ug99, a highly virulent disease, have protected the livelihoods and food security of 500,000 farming families.

Read the CGIAR press release: CGIAR doubles funding to $1 billion in five years, 17 Dec 2013.

Fighting aflatoxins: CGIAR scientists Delia Grace and John McDermott describe the disease threats and options for better control

In this 6-minute film, two leading scientists combatting aflatoxins in the food chains of developing countries describe some of the risks these toxins pose and new options for their better control. Aflatoxins are a naturally occurring carcinogenic byproduct of common fungi that grow on grains and other food crops, particularly maize and groundnuts, as well as in the milk and meat of livestock that have consumed feeds contaminated with aflatoxins. These toxins threaten public health in many poor countries.

In this short film, Delia Grace and John McDermott discuss on-going research to control aflatoxins in developing countries and why this research matters so much.

Delia Grace is a veterinary epidemiologist who leads research on both ‘food safety and zoonoses’ at the International Livestock Research Institute (ILRI) and ‘agriculture-associated diseases’, a flagship project of the CGIAR Research Program on Agriculture for Nutrition and Health (A4NH). John McDermott, another veterinary epidemiologist by training, who formerly served as ILRI’s deputy director general for research and now works for the International Food Policy Research Institute (IFPRI), is director of A4NH (Agriculture for Nutrition and Health), a multi-centre program led by IFPRI.

Earlier this week (4 Nov 2013), IFPRI and its 2020 Vision initiative jointly with the CGIAR Research Program on A4NH released a series of 19 briefs on the state of efforts to combat aflatoxins. ILRI’s Grace co-edited the series with IFPRI’s Laurian Unnevehr: ‘Aflatoxins: Finding solutions for improved food safety’. Grace and Unnevehr themselves developed 2 of the 19 briefs: ‘Tackling aflatoxins: An overview of challenges and solutions’  and The role of risk assessment in guiding aflatoxin policy’. In another of the briefs, Grace zeroes in on the dangers of aflatoxins in animal-source foods: ‘Animals and aflatoxins’. Jagger Harvey and Benoit Gnonlonfin, two scientists with ILRI’s Biosciences eastern and central Africa (BecA) Hub, along with colleagues in Australia and Cornell University, wrote the last brief in the series: ‘Improving diagnostics for aflatoxin detection‘.

Aflatoxins grow naturally on many farms, infesting grains and groundnuts, particularly after drought or insect damage and are a particularly common problem in developing countries, where aflatoxins not only pose a significant public health risk but also create a barrier to trade in agricultural commodities.

‘These toxins have a range of effects on human and animal health,’ says Grace. ‘High doses are lethal to both humans and animals and chronic consumption of lower levels of aflatoxins is associated with liver cancer and immunosuppression in children.’

Researchers have known about the problem of aflatoxins in developing countries for several decades but because these countries have largely informal markets and minimal trade, people have tended to minimize or ignore the problem.

‘But this is changing’, says McDermott. ‘Recent cases of aflatoxin-related deaths in Africa widened appreciation that this problem is important; there’s been a recent increase in investment in different control methods’, he says.

The series of briefs released this week brings together the experiences of researchers both within and outside CGIAR and contributes to efforts to help smallholder farmers better manage aflatoxins on their farms.

The briefs describe health risks from aflatoxins and the state of research on aflatoxins, including new methods of detection, crop breeding and food storage and handling, as well as ways to overcome the market constraints imposed by aflatoxins.

‘We’ve assembled for policy- and other decision-makers the current state of knowledge on what we need to do about aflatoxins in tropical countries,’ says McDermott.

Read more about the briefs released this week:

http://www.ifpri.org/publication/aflatoxins-finding-solutions-improved-food-safety

Read the whole publication: Aflatoxins: Finding solutions for improved food safety, edited by Laurian Unnevehr and Delia Grace

Download

Table of Contents and Introduction

1. Tackling Aflatoxins: An Overview of Challenges and Solutions
by Laurian Unnevehr and Delia Grace

2. Aflatoxicosis: Evidence from Kenya
by Abigael Obura

3. Aflatoxin Exposure and Chronic Human Diseases: Estimates of Burden of Disease
by Felicia Wu

4. Child Stunting and Aflatoxins
by Jef L Leroy

5. Animals and Aflatoxins
by Delia Grace

6. Managing Mycotoxin Risks in the Food Industry: The Global Food Security Link
by David Crean

7. Farmer Perceptions of Aflatoxins: Implications for Intervention in Kenya
by Sophie Walker and Bryn Davies

8. Market-led Aflatoxin Interventions: Smallholder Groundnut Value Chains in Malawi
by Andrew Emmott

9. Aflatoxin Management in the World Food Programme through P4P Local Procurement
by Stéphane Méaux, Eleni Pantiora and Sheryl Schneider

10. Reducing Aflatoxins in Africa’s Crops: Experiences from the Aflacontrol Project
by Clare Narrod

11. Cost-Effectiveness of Interventions to Reduce Aflatoxin Risk
by Felicia Wu

12. Trade Impacts of Aflatoxin Standards
by Devesh Roy

13. Codex Standards: A Global Tool for Aflatoxin Management
by Renata Clarke and Vittorio Fattori

14. The Role of Risk Assessment in Guiding Aflatoxin Policy
by Delia Grace and Laurian Unnevehr

15. Mobilizing Political Support: Partnership for Aflatoxin Control in Africa
by Amare Ayalew, Wezi Chunga and Winta Sintayehu

16. Biological Controls for Aflatoxin Reduction
by Ranajit Bandyopadhyay and Peter J Cotty

17. Managing Aflatoxin Contamination of Maize: Developing Host Resistance
by George Mahuku, Marilyn L Warburton, Dan Makumbi and Felix San Vicente

18. Reducing Aflatoxins in Groundnuts through Integrated Management and Biocontrol
by Farid Waliyar, Moses Osiru, Hari Kishan Sudini and Samuel Njoroge

19. Improving Diagnostics for Aflatoxin Detection
by Jagger Harvey, Benoit Gnonlonfin, Mary Fletcher, Glen Fox, Stephen Trowell, Amalia Berna, Rebecca Nelson and Ross Darnell

References

 

ILRI’s Jimmy Smith on global health and food security: Why developing-country livestock matter so much

Global food security

Jimmy Smith, director general of the International Livestock Research Institute (ILRI) gave a keynote presentation this morning (17 Oct 2013) at the opening of the Global Animal Health Conference, ‘Developing global animal health products to support food security and sustainability’, in Arlington, Virginia.

Smith began his presentation, ‘Global health and sustainable food security: Why the livestock sectors of developing countries matter’, by setting out the state of global food security and questioning how the world will manage to feed itself as the human population grows before stabilizing at about mid-century. Some 60% more food than is produced now will be needed by then, he said. And, somehow, some 75% of that increase will have to come from increases in productivity rather than from increases in land under cultivation. This higher production, he said, must be achieved while at the same time reducing poverty and hunger and addressing environmental, social and health concerns. In addition, the greater food production will have to be achieved in the face of temperatures 2−4 degrees C warmer than today’s.

He pointed out the great nutritional divides in today’s world, and warned of malnutrition’s huge financial as well as public health costs.

Nutritional divides among 7 billion people today

He noted that gains in consumption of meat in poor and emerging economies are greatly outpacing those of the industrialized countries.

Gains in meat consunmption in developing countries outpace those of developed countries

Smith then pointed out how much of the world’s food comes not from large-scale farmers but rather from hundreds of millions of very small-scale farmers in developing countries.

Global food production: From where?

These small-scale food producers, he said, are more competitive than most people think. He cited two examples. In East Africa, one million smallholders keep Africa’s largest dairy herd, Ugandans produce milk at the lowest cost in the world, and Kenya’s small- and large-scale poultry and diary producers have the same levels of efficiency and profits. In Vietnam, 50% of the country’s pig production is done by farmers with less than 100 pigs, and producers keeping just 1 or 2 sows have lower unit costs than those with more than 4 sows. Scientists estimate that Vietnam’s industrial pig production could grow to meet no more than 12% of the national pig supply in the next 10 years, so small-scale farmers will continue to supply most of the country’s pork for the foreseeable future.

Global livestock markets

In a series of graphs, ILRI’s director general presented figures for livestock commodities being global leaders, for the huge global trade in livestock products and for the fast-rising demand for meat, milk and eggs in developing countries.

4 out of 5 of the highest value global commodities are livestock

Percentage increase in demand for livestock products

Global trade of livestock products (milk excluded)

Global trade in livestock products (milk included)

Global animal health

Smith said that the developing world’s smallholder livestock producers can continue to produce most of the world’s milk, meat and eggs only if we can find ways to improve livestock health, especially by reducing food safety problems that reduce market participation by smallholders, by reducing the endemic livestock diseases that greatly lower livestock productivity in developing countries, and by lowering zoonotic disease transmissions that threaten small-scale livestock production in poor countries—as well as human health in all countries.

Food safety in developing countries, where most milk, meat and eggs are sold in informal or ‘wet’ markets, is a bigger problem than most people recognize, the ILRI director general said. He said we need to manage the risks of illness while retaining the benefits—to livelihoods and food and nutritional security—of informally sold livestock foods. And, he said, we have to educate people about the various risks of these informal markets, where common perceptions can be misleading; eating vegetables sold in these markets, for example, can be as risky to health as handling cattle or drinking raw milk.

Gender is an important determinant of food safety in developing countries, Smith said, with evidence indicating that Africa’s women butchers sell safer meat than their male counterparts. Women and children and farm workers are also at greater risking in contracting food-borne diseases.

Regarding health advice, Smith argued that it is most useful when it is tailored for specific circumstances, when it is based on evidence, and when it is developed in and with local communities. It’s also been found that what works best for increasing food safety are social incentives (e.g., ‘good parents do X rather than Y with their milk cows’), and risk- rather than rule-based approaches. Finally, he said, relatively simple and cheap interventions can lead to substantial improvements in food safety.

The big livestock productivity gaps between rich and poor countries, Smith explained, are due largely to poor animal health in these countries.

Big productivity gaps, largely due to poor animal health, persist between rich and poor countries

Livestock diseases take a huge toll . . .

Annual losses from selected diseases--Africa and South Asia

. . . especially in Africa.

Animal disease is a key constraint in Africa

And the toll from ‘zoonotic’ diseases, which are transmitted from animals to people, is especially devastating.

A deadly dozen zoonotic diseases each year kill 2.2 million people and sicken 2.4 billion

These zoonotic infections harm poor people the most.

Greatest burden of zoonoses falls on one billion poor livestock keepers

Incidences of zoonotic events are worringly on the increase . . .

Emerging zoonotic disease events, 1940-2012

. . . and can have enormous costs . . .

Costs of emerging zoonotic disease outbreaks

. . . as they spread, just as African swine fever is now spreading.

Africa swine fever threatens US$150-billion global pig industry

Global animal health markets

The animal health markets in developing countries are already significant and are growing rapidly. The global animal health market is a multi-billion-dollar industry. The global human health market amounts to US$1000 million and the global animal health market, including livestock, pets and other animals, some $20 billion. The global livestock health market is worth about $13 billion, with the livestock health market in Africa now experiencing a 15.7% year-on-year growth (the second fastest growth after Latin America).

Just 15 countries make up more than 85% of the global animal health market today; demand for animal health markets in developing and emerging economies is increasingly important.

Take India, for example.

Animal health markets: India

To take advantage of the increasing opportunities in developing countries will require an understanding of smallholder livestock systems and customers, who will need tailored packaging and marketing (e.g., drugs in small packets), delivery systems appropriate for widely dispersed farms, surveillance systems for development of drug resistance, and ‘One Health’ approaches and ‘Rational Drug Use’ used for both people and their animals. Among the ‘game-changing’ livestock health products urgently needed in poor countries and communities are appropriate vaccines for Newcastle disease in poultry and East Coast fever in cattle and quality assurance for all veterinary medicines.

Jimmy Smith ended his presentation with four key messages:

Global health and sustainable food security: Key messages

And he closed his presentation the following thoughts.

The risks of ignoring pressing animal health issues in the developing world are huge:

  • Lost livelihoods in poor countries
  • Greater global food insecurity
  • Increased risk of human illness in all countries

The opportunities for improving animal health in developing countries are just as big. With appropriate approaches, this significant animal health market should grow rapidly, for the good of all.

View the presentation.

See other recent presentations by Jimmy Smith:

Improving the environmental sustainability of livestock systems in the developing world–ILRI’s Jimmy Smith, 30 Sep 2013

Why the world’s small-scale livestock farms matter so much: Keynote address at International Grasslands Congress, Part 1, 16 Sep 2013

Why tackling partial truths about livestock matters so much: Keynote address at International Grasslands Congress, Part 2, 16 Sep 2013

More presentations by Jimmy Smith.

Scissors and crazy glue: Lorne Babiuk, award-winning vaccine evangelist, speaks his (clear) mind in Ottawa

Vish Nene and new ILRI Board Member

Director of ILRI’s vaccine development program Vish Nene (left) with Canadian vaccinologist and ILRI board member Lorne Babiuk (right) at morning tea with ILRI staff (photo credit: ILRI/Susan MacMillan).

Canadian Lorne Babiuk, an internationally recognized leader in vaccine research, visited the International Development Research Centre (IDRC) in Ottawa yesterday (8 Oct 2013) to deliver a live webcast talk on exciting breakthroughs in the development of animal vaccines, which, he argued, can both improve global food security and reduce the global impacts of infectious diseases.

Babiuk is vice-president of research at the University of Alberta and the recipient of two recent distinguished awards for his outstanding career in vaccinology — the Gairdner Wightman Award in 2012 and the Killam Prize in Health Sciences in 2013. He serves on the board of trustees of the International Livestock Research Institute (ILRI).

For all his illustrious awards, Babiuk talked not like a scientist but rather like ‘a regular guy’, preferring to speak of  ‘scissors’ and ‘crazy glue’ to describe molecular advances in vaccinology rather than use scientific jargon.

Here’s some of what he said.

ON POVERTY
One billion people go to bed hungry every night. Not hungry like you and me when we miss a meal. But hungry, really hungry, every day, day in and day out. By 2050, we’ll have another 2 billion people to feed. The last time I checked, they were not making more land. So we’re going to have to do more with the land (and livestock) that we have. We have an opportunity to develop new approaches to increase food supplies or to have a lot more hungry people.

The developing world is looking for more and more protein; those of us in the developed world should not deny them that.

Livestock are a critical component of smallholder farming, which supports about two billion people, some two-thirds of them women

ON DISEASE
I’ve spent my career in infectious diseases. They matter partly because they cost so much. Alberta has still not recovered from BSE. And SARS cost a staggering USD100 billion—USD2 billion in Ontario alone.

Some 74% of new or emerging diseases are ‘zoonotic’, which means they’re transmitted from animals to humans, or from humans to animals. The economic impacts of zoonoses are huge for farmers, for producers, for international traders . . .

ON DISEASES OF THE DEVELOPING WORLD
I have concerns about Rift Valley fever spreading to North America. The West Nile virus, which has the same kind of vector, has already arrived here.

ON BIOTECH
Technology and biotechnology can be a saviour, but it’s a challenge because we have a large number of people against genetically modified food. We have to work with social scientists to make sure we have healthy animals for healthy people

ON RESEARCH
Basic research and applied research are two sides of the same coin—the two of them need each other.
We no longer train our biologists in broad biology but rather in narrower molecular biology studies. That’s a mistake.
We biological scientists must get smarter at engaging social science and scientists.

ON VACCINES
Vaccination has saved more lives than all other treatments and prophylactics combined.
The traditional types of vaccines, live or killed, have given way to really interesting new types.
We eradicated smallpox with a vaccine; that research would never be approved today because the vaccine has too many side effects.
What can we do to change perceptions of vaccines and biotechnology?
It costs something in the order of one billion dollars to get a vaccine approved.

ON VACCINES FOR THE DEVELOPING WORLD
The major obstacle in Africa is to get a commercial company to invest in the regulatory component of a vaccine because there isn’t a financial incentive. You can’t sell a livestock vaccine for much more then 50 cents per dose in a developing countries. That’s why we have to work with African or Asian vaccine companies, which can produce vaccines much cheaper than industrial countries can.

Several diseases in the developing world are protozoan and those are, of course, much bigger challenges. But there have been new donors for protozoan vaccine research. We need to convince more donors that this research is needed.

ON THE ANTI-VACCINE LOBBY
I’m an evangelist for vaccination because I think we have lost the battle to the anti-vaccine lobby. In North Amercia there is a huge anti-tech group. They misquote or use data to push their own agenda at the expense of large numbers of lives lost. Look at the article published decades ago about a possible link between vaccination and autism. Despite decades of subsequent research showing no such links, we still haven’t managed to convince a lot of people that vaccines do not cause autism.

How do we encourage the scientific community to stand up and be more vocal about what they know? We have to continue to advocate and demonstrate what we can do using the new technology. We should promise less and deliver more. We have been our own worst enemies. We have to be realists and say what can be done in what time period. That will give us back some credibility.

People go into science because they like doing the science part of it. If they loved the podium, they would have gone into the social sciences. We need to encourage others to do this kind of communication.

ON TEAM DYNAMICS
Any successful researcher has to stimulate the team around him or her and make them all feel part of something big. Getting people excited about working together as a team, providing a vision, and saying how the team can achieve something, that’s what I’m good at. Get people passionate about something and get them to know it’s their idea. I’m a facilitator. I don’t tell people what to do. I create an environment that facilitates what they do. You have to accept different cultures, different ways of doing science. You have to have patience and go with the flow. I learned patience.

ON HIS SUCCESSFUL CAREER
I still get up in the morning and put one leg in my pants and then the other, just like everyone else.

About CIFSRF
Lorne Babiuk manages a grant funded by the Canadian International Food Security Research Fund (CIFSRF), among others. CIFSRF is a CA$124.5-million program of IDRC undertaken with financial support from the Government of Canada. CIFSRF supports applied research partnerships between Canadian and developing-country organizations to find lasting solutions to hunger and food insecurity. It is a core element of Canada’s Food Security Strategy.

For more information, see the IDRC website.

Experts meet to share tactics in fight against ‘goat plague’: Filmed highlights

 

Watch this short (3:50 minutes) film on the views of participants at a recent meeting to coordinate research strategies for a disease of small ruminants known as peste des petits ruminants, or PPR. This second meeting of the Global Peste de Petits Ruminants (PPR) Research Alliance, held 29–30 April 2013 in Nairobi, Kenya, brought together over 60 livestock experts from across the world.

The harm caused by PPR, also known as ‘goat plague’ because it is closely related to ‘cattle plague’, or rinderpest, has been increasing in recent years, especially across Africa and Asia. This infectious viral disease of sheep and goats poses a major threat to the livelihoods of smallholder farmers. The disease is highly contagious, with roughly an 80 per cent mortality rate in acute cases.

‘We’re bringing together the relevant animal health experts so that we can find ways to better coordinate the diverse research on PPR, and determine the fastest and most effective and efficient ways to better control it in different developing-country regions and circumstances’, said Geoff Tooth, the Australian High Commissioner to Kenya.

The meeting was co-hosted by four institutions: the African Union-Interafrican Bureau for Animal Resources (AU-IBAR), the Australian Agency for International Development (AusAID), the Biosciences eastern and central Africa-ILRI Hub (BecA-ILRI Hub) and the International Livestock Research Institute (ILRI).

A current AusAID-funded project being conducted by the BecA-ILRI Hub and Australia’s Commonwealth Scientific, Industrial and Research Organisation (CSIRO) has supported development of a thermostable vaccine that is now being piloted in vaccination campaigns in Sudan and Uganda, with similar work proposed for Ethiopia.

Read more about efforts to develop a pan-African strategy to fight goat plague: http://www.ilri.org/node/1344

Dialing back on the drivers of global disease outbreaks: A look inside the ‘black box’

Pathogen flow at the wildlife–livestock–human interface

 

As published in PNAS 2013: 1208059110v1-201208059. Zoonosis emergence linked to agricultural intensification and environmental change, by Delia Grace and others, May 2013.

By Michelle Geis

A new report on the ‘causes of causes’ of H7N9 and other diseases that are emerging in animals and jumping species—into people

The deadly H7N9 bird flu virus in China and the spread of a SARS-like coronavirus in the Middle East continue to make headlines. H7N9 has killed 35 people  in China and 20 have lost their lives to the novel coronavirus—which has spread from Saudi Arabia to the UK, France and Germany.

Two opinion editorials in the New York Times last week, The next contagion: Closer than you think and The next pandemic: Not if, but when, correctly warn us about the potential global spread of these killer diseases. They call for more awareness of the dangers of zoonotic (animal-to-people) diseases, faster identification of animal sources of the pathogens and better vaccines to protect us against them. All of those are indeed needed.

But like much of the mainstream press, neither article mentions the root cause of these emerging infectious diseases, that is, the conditions that make zoonoses likely to arise in the first place and then help turn them into lethal pandemics.

These ‘causes of causes‘ of zoonotic disease outbreaks and their spread are pinpointed in a paper published this week in the Proceedings of the National Academy of Sciences (PNAS). Delia Grace, a veterinary epidemiologist and food safety specialist at the International Livestock Research Institute (ILRI), in Nairobi, Kenya, and other scientists argue in this paper that we’ll only become capable of preventing or stopping the next pandemic when we better understand the drivers of disease emergence.

Some of these disease triggers are well-documented, if not well publicized. We know that rising demand for more meat and dairy products in rapidly growing developing countries, where cities and slums are densely crowded with livestock as well as people, can be a culprit. We know that animals kept in stressful as well as crowded conditions can be culprits. And we know that our expanding agriculture is fragmenting habitats, stressing wildlife and bringing people into contact with animals carrying pathogens, and reducing biodiversity, all of which encourage wildlife diseases to jump species.

A table published in the peer-reviewed article (see below) shows what conditions led to Ebola, HIV, SARS, Nipah, avian flu, Japanese encephalitis and more. Acknowledging and investigating these factors can provide governments and global health officials with important clues as to the next probable outbreak.

13PNAS_Grace_Figure1 copy

Table published in PNAS 2013: 1208059110v1-201208059. Zoonosis emergence linked to agricultural intensification and environmental change.

So, what is it that’s preventing us from anticipating and stopping the next global pandemic since we know the conditions likely to produce one? For one thing, as the paper discusses, the conditions that trigger diseases are changing more rapidly than the research that examines them.

Another challenge is that though an emerging disease event is reported somewhere in the world on average every four months, the likelihood of emergence in any given farm or farming system is low.

As Grace explains, ‘Taking action to slow the drivers of disease is good for humanity but not likely to have any observable benefits to the individual farmer. Hence, the society that benefits from less disease emergence must provide the incentives to dial back on the drivers.’

Finally, the world is increasingly farming on the margins, with most of the last few remaining near-pristine ecosystems now being invaded and destabilized. Just as inexorable is the move to rapidly growing cities of poor rural people, who are bringing their livestock with them. The resulting losses of biodiversity, and the rise of genetically improved, and thus similar, animal populations, also increases the risk of a pandemic emerging. Climate and environmental changes are generally making matters worse.

Grace says research must better examine the complex, context-specific, and interrelated nature of zoonotic pathogen emergence.

‘First’, she said, ‘we need to look inside the black box of the big trends driving disease emergence: urbanization, intensification, globalization, loss of habitat and biodiversity.

‘We also need to understand what causes matter most in different situations and which are amenable to mitigation.

‘And we need to develop ways of doing agriculture differently, ways that not only reduce disease emergence but also can be adopted at large scale.

‘Given that disease emergence is predictably unpredictable, much can be achieved by understanding, monitoring and managing pathogen dynamics before infectious agents emerge.’

Read the paper in Proceedings of the National Academy of Sciences: Zoonosis emergence linked to agricultural intensification and environmental change, by Bryony A Jones, Delia Grace, Richard Kock, Silvia Alonso, Jonathan Rushton, Mohammed Y Said, Declan McKeever, Florence Mutua, Jarrah Young, John McDermott and Dirk Udo Pfeiffer, PNAS 2013 : 1208059110v1-201208059.

Michelle Geis is a Washington DC-based science communications expert who works for Burness Communications.

New advances in the battle against a major disease threat to cattle and people in Africa

ILRI research on biotechnology to fight a major disease threat to cattle and people in Africa

An 8-month old cloned Boran calf named Tumaini (meaning ‘hope’ in Kiswahili), on the left, is part of a long-term ILRI research project to develop cattle for Africa that are genetically resistant to trypanosomiasis (photo credit: ILRI/Paul Karaimu).

The International Livestock Research Institute (ILRI), a member of the CGIAR Consortium, is a non-profit organization based in Africa. ILRI’s mission is to use the best and safest livestock science available to confront poverty, hunger, and disease in the developing world, where livestock provide livelihoods and food for hundreds of millions of people.

One of ILRI’s most important priorities today is to help poor livestock keepers in Africa deal with the constant threat of a devastating disease called trypanosomiasis. This disease is arguably Africa’s most important livestock disease, wasting and killing cattle, commonly the most important asset of poor households. The human form of the disease is called sleeping sickness, which afflicts tens of thousands of people every year, killing many of them, and putting tens of millions more people at risk.

As part of ILRI’s comprehensive fight against trypanosomiasis, the institute is now in the very early stages of a project to develop disease-resistant cattle, which could save the lives of livestock and people both. Thus far, ILRI and its partners have taken a preliminary step in the process, which involved successfully cloning a male calf from one of East Africa’s most important cattle breeds, the Boran. The calf is healthy and is being raised at ILRI’s research facilities in Kenya.

A next step is to develop a new Boran clone modified with a gene that naturally confers resistance to the disease. This involves using a synthetic copy of a gene sequence originally identified in baboons that should protect cattle against this devastating disease.

A final step will be to use these disease-resistant cattle in breeding schemes that will provide African countries with another option in their fight against trypanosomiasis.

This research potentially offers a reliable, self-sustaining and cost-effective way of protecting tens of millions of African cattle against disease and untimely death, as well as dramatically reducing poverty across Africa. By reducing the reservoir of pathogens, this should also help to save thousands of human lives each year.

It could take up to two decades to develop disease-resistant cattle herds for Africa. ILRI and its partners are also continuing to pursue other options for fighting trypanosomiasis, such as rationale drug treatment and integrated disease control methods.

For ILRI, public safety and animal welfare are paramount; this means working with all the relevant Kenyan and international regulatory authorities to ensure that the highest bio-safety standards are always employed. In line with its commitment to transparency, ILRI places all of its research results in the public domain.

ILRI is working with a team that includes scientists from New York University, along with experts from the Roslin Institute in Scotland, and Michigan State University in the USA. The fundamental research aspects of this project are being funded by the US National Science Foundation.

For further information, see:
ILRI website:
http://www.ilri.org/breadtrypanosome

National Science Foundation:
www.nsf.gov/news/news_summ.jsp?cntn_id=116932

2009 paper published in the Proceedings of the National Academy of Sciences (USA) on original breakthrough in this research project:
http://dx.doi.org/10.1073%2Fpnas.0905669106

Or contact one of the following people:

Jimmy Smith
ILRI Director General
j.smith@cgiar.org

Suzanne Bertrand
ILRI Deputy Director General for Biosciences
s.bertrand@cgiar.org

Steve Kemp
Leader of ILRI’s research on this topic
s.kemp@cgiar.org

About ILRI: better lives through livestock
www.ilri.org
The International Livestock Research Institute (ILRI) works with partners worldwide to enhance the roles that livestock play in food security and poverty alleviation, principally in Africa and Asia. The outcomes of these research partnerships help people in developing countries keep their farm animals alive and productive, increase and sustain their livestock and farm productivity, find profitable markets for their animal products, and reduce the risk of livestock-related diseases. ILRI is a not-for-profit institution with a staff of about 600 and, in 2012, an operating budget of about USD 60 million. A member of the CGIAR Consortium working for a food-secure future, ILRI has its headquarters in Nairobi, Kenya, a principal campus in Addis Ababa, Ethiopia, and offices in other countries in East, West and Southern Africa and in South, Southeast and East Asia.

About CGIAR: working for a food-secure future
www.cgiar.org
CGIAR is a global partnership that unites organizations engaged in research for a food-secure future. It is carried out by 15 centres that are members of the CGIAR Consortium and conducted in close collaboration with hundreds of partner organizations, including national and regional research institutes, civil society organizations, academia and the private sector. The CGIAR’s 8,000 scientists and staff work in the developing world to reduce rural poverty, increase food security, improve human health and nutrition, and ensure more sustainable management of natural resources. With unparalleled research infrastructure and dynamic networks across the globe, and maintaining the world’s most comprehensive collections of genetic resources, CGIAR is the only institution with a clear mandate on science and technology development for the eradication of hunger and poverty at the global level.

Alliance meeting this week to battle global ‘goat plague’

Northern Kenya August 2008

The PPR virus, commonly known as goat plague, swept across southern Ethiopia and northern Kenya in 2008; Mohammed Noor lost 20 goats in the just one week and wondered how he would provide for his family (photo on Flickr by EC/ECHO/Daniel Dickinson).

Assembling for two days this week (29–30 Apr 2013) in Nairobi, Kenya, are members of a global alliance against ‘peste des petits ruminants’, abbreviated as ‘PPR’ and also known as ‘goat plague’ and ‘ovine rinderpest’.

Co-hosting this second meeting of the Global Peste de Petits Ruminants (PPR) Research Alliance (hereafter referred to as GPRA) are the International Livestock Research Institute (ILRI), which is headquartered in Nairobi; the Biosciences eastern and central Africa-iLRI hub (BecA-ILRI Hub), hosted and managed by ILRI; the African Union-Interafrican Bureau for Animal Resources (AU-IBAR), also based in Nairobi; and the Australian Agency for International Development (AusAID).

Among the 70 or so people attending are representatives from the Bill & Melinda Gates Foundation (BMGFYi Cao), the Global Alliance for Livestock Veterinary Medicines (GALVMedBapti Dungu), the International Atomic Energy Agency (IAEAAdama Diallo), the Pan African Veterinary Vaccine Centre (PANVAC), the Royal Veterinary College of the University of London Vet School (RVC), the United Nations Food and Agriculture Organization (FAOVincent Martin and Robert Allport, among others), the World Organisation for Animal Health (OIEJemi Domenech and Walter Masiga) and a range of national research institutions from developing countries where the disease is endemic.

What’s this alliance all about?
The GPRA is a participant-owned network of researchers and development professionals with an interest in the progressive control of PPR. The GPRA was inaugurated in 2012 at a meeting in London. GPRA aims to provide scientific and technical knowledge towards methods for the detection, control and eradication of PPR that are economically viable, socially practical and environmentally friendly.

Why, and how much, does PPR matter?
Infectious diseases remain the major limitation to livestock production globally and are a particular scourge in the developing world, where most of the world’s livestock are raised. Diseases not only kill farm animals but also cause production losses and hinder access to potentially high-value international livestock markets.

PPR, an infectious viral disease of sheep and goats, poses a major threat to the livelihoods of smallholder farmers in Africa as well as the Middle East and India. The disease is highly contagious, and has roughly an 80 per cent mortality rate in acute cases.

The impacts of PPR, which is closely related to rinderpest in cattle, have been expanding in recent years. At least 15 million sheep and goats are at risk of death from the disease in Kenya alone and the estimated economic impact of current PPR outbreaks—including production losses and disease control costs for Africa—is more than US$147 million per year. A recent outbreak of PPR in the Marakwet and Baringo districts of Kenya destroyed more than 2000 herds, with the disease spreading in days and farmers losing some KShs6 million (about US$70,000)  to the disease over about three months.

PPR is probably the most important killer of small ruminant populations in affected areas and some 65 per cent of the global small ruminant population is at risk from PPR.

Increasing interest in tackling PPR
Over the last several years, international experts and national authorities have both been increasingly prioritizing the progressive control of PPR, with the first phase designed to contribute to the long-term goal of eradication. Donor interest in this research and development area quickly ramped up over the past year. A current AusAID-funded project being conducted under a partnership between the BecA-ILRI Hub and Australia’s Commonwealth Scientific, Industrial and Research Organisation (CSIRO) has supported development of a thermostable vaccine now being piloted in vaccination campaigns in Sudan and Uganda, with similar work proposed for Ethiopia.

Collins Owino, ILRI research technician

Collins Owino, an ILRI research technician working on vaccines and diagnostics in the peste des petits ruminants (PPR) project (photo credit: ILRI/Evelyn Katingi).

Need for coordinated and progressive control of PPR
There is a growing recognition of the need for, and potential benefits of, a coordinated approach to the progressive control of PPR. The disease is now one of the high priorities of AU-IBAR, FAO and OIE, all of which have strong networks and expertise to offer the alliance. The role of the Global PPR Research Alliance as a network of research and development organizations is to develop a coordinated strategy to contribute to the progressive control of PPR.

The Australian Government, together with AU-IBAR and ILRI, is supporting the second meeting of the GPRA to advance with many other stakeholders progressive global control of PPR, particularly through collaborative research. The GPRA supports the sharing of relevant information and results, the establishment of productive working relationships among stakeholders, the establishment of research and development projects of interest to some or all members, and the closer linking of strategic plans of all stakeholders in better control of this disease.

Is progressive eradication of PPR possible?
Wide calls for PPR’s progressive global eradication cite the following factors supporting this goal:

  • The close relationship of PPR/’goat plague’ with the recently eradicated ‘cattle plague’ known as ‘rinderpest’ (rinderpest was only the second infectious disease, and the first veterinary disease, to be eradicated from the globe)
  • The availability of effective vaccines against PPR
  • The development of heat-stable PPR vaccines, following the same procedures that were so effective in developing a heat-stable rinderpest vaccine
  • The opportunity to increase focus on Africa and Asia’s small ruminants, which are of critical importance to the livelihoods of rural smallholder and pastoralist communities in many of the world’s poorest countries
  • The existence of vaccines and diagnostics considered sufficient to initiate the program; the current vaccines (based on the strain Nigeria 75/1) are safe, efficacious and provide life-long immunity.

More about the AusAID-funded PPR project at the BecA-ILRI Hub
The Australian Government via AusAID has funded development at ILRI of thermostable formulations of the PPR vaccine that provide a level of stability in the field as high as that demonstrated in the vaccine used to eradicate rinderpest. The project team has demonstrated that the PPR vaccine can be stored without refrigeration for extended periods of time without significant loss in viability. This is a crucial and significant success. Under the guidance of ILRI senior scientist Jeff Mariner and with the assistance of Australia’s CSIRO and BecA-ILRI Hub staff, the project team have developed strong links with AU-IBAR’s Henry Wamwayi, a senior member of his organization seconded to the PPR project.

ILRI veterinary epidemiologist Jeff Mariner at OIE meeting

ILRI veterinary epidemiologist Jeff Mariner presenting lessons learned from work to eradicate rinderpest at a meeting of the World Animal Health Organisation (OIE) (photo credit: OIE).

Next steps
The project has built on lessons learned from the recent global eradication of rinderpest, which depended on two equally important breakthroughs for its success: development of an effective thermostable vaccine and effective vaccine delivery networks in remote as well as other regions. The next 12 months of the PPR research project will focus on testing the vaccine and delivery strategies in South Sudan and Uganda. Staff will assess in the field just how effective the vaccine is in controlling PPR infections. They’ll also investigate some practical incentives for encouraging livestock owners and livestock service delivery personnel to participation in PPR control programs. And they’ll look into ways to build and enhance public-private community partnerships to deliver the PPR vaccine.

Read more in the ILRI News Blog and science journals about the close connections between the eradication of rinderpest and this new battle against PPR—and the role of ILRI’s Jeff Mariner in development of thermostable vaccines necessary to win the battle against both diseases.

Rinderpest: Scourge of pastoralists defeated, at long last, by pastoralists, 18 Sep 2012.

New analysis in ‘Science’ tells how the world eradicated deadliest cattle plague from the face of the earth, 13 Sep 2012.

Goat plague next target of veterinary authorities now that cattle plague has been eradicated, 4 Jul 2011.

Deadly rinderpest virus today declared eradicated from the earth—’greatest achievement in veterinary medicine’, 28 Jun 2011.

 

 

As a new round of bird flu hits China, livestock scientist advises to ‘panic slowly’

China

At the chicken market in Xining, Lanzhou Province, China (photo on Flickr by Padmanaba01).

By Matthew Davis

The initial news reports were slim on details but the reaction was swift. There were at least three people dead in China after apparently contracting influenza from birds. Prices of soybean—a major ingredient in livestock feed—immediately took a dive.

Then the death toll rose to five, virus samples were detected in pigeons, and in Shanghai authorities began slaughtering poultry flocks. Within a few days the death count was up to seven, then nine. And people started to wonder about a connection to all those pig carcasses floating down Shanghai waterways.

Such is the confusing swirl of information emanating from the latest incident in which a worrisome disease has passed from animal to human, a phenomena—and a quite common one at that—known as zoonoses. In this instance, it’s an influenza virus called H7N9 that appears to have originated in wild or domestic bird populations, but much about its source remains murky.

For Delia Grace, a veterinary epidemiologist at the International Livestock Research Institute (ILRI) who spends most of her waking hours studying zoonotic events around the world, there are two essential facts to keep in mind as the situation in China evolves. And they embody how difficult it can be to craft a proper response.

One: the vast majority of zoonoses outbreaks do not escalate to crisis proportions. But, two:  every now and then, as happened with Spanish flu in 1918 and AIDS in more recent times, an animal disease jumps to human hosts and causes a ‘civilization altering event’.

Grace suggests the appropriate reaction is to ‘panic slowly’. In other words, be prepared to move quickly if things get worse, but don’t over-react to the early reports. Also, keep in mind that, just based on what gets reported, a new disease emerges somewhere in the world about every four months.

For example, Grace noted that epidemiologists in the United Kingdom, Germany, and the Middle East are probably more concerned right now about a new and deadly corona virus that as of late March had killed 11 of the 17 people known to have been infected. There is evidence that at least one of the infections may have originated in racing camels.

Grace advises decision-makers in the public and private sector to channel the impulse to take action toward addressing conditions that are intensifying zoonotic threats.

We know that in certain parts of the world, livestock intensification is being pushed well beyond the limits of anything we have done in agriculture in the past’, she said. ‘There are hundreds of thousands of animals packed together and little transparency about how they are being managed. And that’s making disease experts pretty nervous.’

But Grace cautions against focusing solely on the risks posed by certain livestock practices and ignoring the fact that livestock are a major source of food and income for 1 billion of the world’s poorest people. She worries that misguided reactions to emerging zoonotic diseases can end up doing significant harm to their lives and livelihoods.

For example, in 2009, the Egyptian government  ordered the mass slaughter of pigs tended by Coptic Christians on the mistaken belief that the pigs were linked to the H1N1 flu pandemic. Also, the possible link in Asia between a different, and also deadly, form of avian influenza called H5N1 and ‘backyard’ poultry farming has prompted a shift to more industrial-scale production. Yet, as Grace points out, given the problems plaguing industrial operations in the region, this shift could actually increase the risk of zoonotic diseases while imperiling the food security of livestock keepers.

‘The proper reaction to the risks posed by emerging zoonotic diseases is not to indiscriminately slaughter animals. That could threaten the health of far more people by depriving them of their primary source of protein and other nutrients’, Grace said.

What we need to do is look at the many ways livestock production has gone wrong—lack of diversity in animals, using drugs to mask signs of diseases, dirty conditions—and put them to right.

Matthew Davis is a Washington DC-based science writer and policy analyst; he also serves as a senior consulting writer for Burness Communications.

The spatial ecology of pigs: Where free-range doesn’t come free

IMG_0080

A report on the economic as well as health risks of keeping free-range pigs in western Kenya has been published by scientists in the animal health laboratories at ILRI’s Nairobi, Kenya, campus; here, two of the authors, lead author Lian Thomas (left) and principal investigator Eric Fèvre (right), inspect a household pig in their project site, in Busia, in western Kenya (photo credit: ILRI/Charlie Pye-Smith).

Like your livestock products to come from free-range systems? Consider that a healthy alternative to the factory farming of livestock? Consider the lowly pig, and what serious pathogens it can pick up, and transmit to other animals and people, in the course of its daily outdoor scavenging for food. Consider also the scavenging pig’s coprophagic habits (consumption of faeces) and you may change your mind.

A recent study has brought those habits to light. The study was conducted in an area surrounding Busia town, in western Kenya (Busia lies near Kenya’s western border with Uganda; Lake Victoria lies to the south). The study was conducted by scientists at the International Livestock Research Institute (ILRI) and the University of Edinburgh to better understand the transmission of several pathogenic organisms. This is the first study to investigate the ecology of domestic pigs kept under a free-range system, utilizing GPS technology.

Most people in Busia farm for a living, raising livestock and growing maize and other staple food crops on small plots of land (the average farm size here is 0.5 ha). More than 66,000 pigs are estimated to be kept within a 45-km radius of Busia town.

ILRI's Lian Thomas with pig in western Kenya

ILRI’s Lian Thomas with a household pig in western Kenya (photo credit: ILRI/Charlie Pye-Smith).

A GPS collar was put on 10 pigs, each nearly 7 months old, that were recruited for this study. A handheld GPS unit was used to obtain the coordinates of the homesteads to which the selected pigs belonged; the perimeters of the homesteads and their main features, including human dwellings, cooking points, rubbish disposal areas and latrines, were all mapped. The pig collars recorded the coordinates of the pigs every 3 minutes during the course of one week.

All the 10 pigs were kept under free-range conditions, but also regularly fed supplementary crop and (mostly raw) household waste. All the pigs recruited were found to be infected with at least one parasite, with most in addition also having gastrointestinal parasites, and all carried ticks and head lice.

The pigs, which scavenge both day and night, were found to spend almost half their time outside the homestead, travelling an average of more than 4 km in a 12-hour period (both day and night), with a mean home range of 10,343 square meters. One implication of this is that a community approach to better controlling infectious diseases in pigs will be better suited to this farming area than an approach that targets individual household families.

Three of the ten pigs were found to be infected with Taenia solium, a pig tapeworm whose larva when ingested by humans in undercooked pork causes the human disease known as cysticercosis, which can cause seizures, epilepsy and other disorders, and can be fatal if not treated. T solium infection in pigs is acquired by their ingestion of infective eggs in human faecal material, which is commonly found in the pigs environments in rural parts of Africa as well as Mexico, South America and other developing regions.

This study found no correlation between the time a pig spent interacting with a latrine at its homestead and the T solium status of the pig. The paper’s authors conclude that ‘the presence or absence of a latrine in an individual homestead is of less relevance to parasite transmission than overall provision of sanitation for the wider community in which the pig roams’. With a quarter of the homesteads in the study area having no access to a latrine, forcing people to engage in open defecation, and with less than a third of the latrines properly enclosed, there are plenty of opportunties for scavenging pigs to find human faeces.

IMG_0131

A typical household scavenging pig and pit latrine in the project site in Busia, Kenya (photo credit: ILRI/Charlie Pye-Smith).

Improved husbandry practices, including the use of effective anthelmintics at correct dosages, would enhance pig health and production in this study area.

One of the interesting findings of the study is that all this pig roaming is likely to be helping to reduce the weight of the pigs at slaughter. Mean live weights at the abattoir in the Busia area are 30 kg, giving a dressed weight of only 22.5 kg and earning the farmer only KShs.2000–2500 (USD24–29) per animal.

Encouraging the confinement of pigs is likely to improve feed conversion and weight gain, by both reducing un-necessary energy expenditure as well as limiting parasite burden through environmental exposure.

‘Confinement of pigs would also reduce the risk of contact with other domestic or wild pigs: pig to pig contact is a driver of African swine fever (ASF) virus transmission. ASF regularly causes outbreaks in this region . . . . Confining pigs within correctly constructed pig stys would also reduce the chances of contact between pigs and tsetse flies.’ That matters because this western part of Kenya is a trypanosomiasis-endemic area and pigs are known to be important hosts and reservoirs of protozoan parasites that cause both human sleeping sickness, which eventually is fatal for all those who don’t get treatment, and African animal trypanosomiasis, a wasting disease of cattle and other livestock that is arguably Africa’s most devastating livestock disease.

In addition, both trichinellosis (caused by eating undercooked pork infected by the larva of a roundworm) and toxoplasmosis (caused by a protozoan pathogen through ingestion of cat faeces or undercooked meat) are ‘very real threats to these free-ranging pigs, with access to kitchen waste, in particular meat products, being a risk factor for infection. Such swill is also implicated in ASF transmission’.

While confining pigs would clearly be advantageous for all of these reasons, the practice of free range will likely be hard to displace, not least because this low-input system is within the scarce means of this region’s severely resource-poor farmers. Local extension services, therefore, will be wise to use carrots as well as sticks to persuade farmers to start ‘zero-scavenging’ pig husbandry, Fortunately, as this study indicates, they can do this by demonstrating to farmers the economic as well as health benefits they will accrue by penning, and pen-feeding, their free-ranging pigs.

Scavenging pigs in Busia, western Kenay

Scavenging pigs in Busia, western Kenya (photo credit: ILRI/Charlie Pye-Smith).

Project funders
This research was supported by the Wellcome Trust, BBSRC (Biotechnology and Biological Sciences Research Council) and MRC (Medical Research Council), all of Great Britain. It is also an output of a component of the CGIAR Research Program on Agriculture for Nutrition and Health investigating Agriculture-Associated Diseases.

Read the whole paper
The spatial ecology of free-ranging domestic pigs (Sus scrofa) in western Kenya, by Lian Thomas, William de Glanville, Elizabeth Cook and Eric Fèvre, BMC Veterinary Research 2013, 9:46. doi: 10.1186/1746-6148-9-46

Article URL
http://www.biomedcentral.com/1746-6148/9/47  The publication date of this article is 7 Mar 2013; you will find here a provisional PDF; fully formatted PDF and full text (HTML) versions of the paper will be available soon.

About the project
Begun in 2009 and funded by the Wellcome Trust, with other support from ILRI, this project has studied neglected zoonotic diseases and their epidemiology to raise levels of health in poor rural communities. The project, People, Animals and their Zoonoses (PAZ), is based in western Kenya’s Busia District and is led by Eric Fèvre, who is on joint appointment at ILRI and the University of Edinburgh. More information can be found at the University of Edinburgh’s Zoonotic and Emerging Diseases webpage or on ILRI’s PAZ project blog site.

The May 2010 issue of the Veterinary Record gives an excellent account of this ambitious human-animal health project: One medicine: Focusing on neglected zoonoses.

Related stories on ILRI’s AgHealth, Clippings and News blogs
Tracking of free range domestic pigs in western Kenya provides new insights into dynamics of disease transmission, 22 Mar 2013.
Aliens in human brains: Pig tapeworm is an alarming, and important, human disease worldwide, 23 May 2012.
Forestalling the next plague: Building a first picture of all diseases afflicting people and animals in Africa, 11 Apr 2011. This blog describes an episode about this project broadcast by the Australian science television program ‘Catalyst’; you can download the episode here: ABC website (click open the year ‘2011’ and scroll down to click on the link to ‘Episode 4’; the story starts at 00.18.25).
Edinburgh-Wellcome-ILRI project addresses neglected zoonotic diseases in western Kenya, 28 Jul 2010.

Human health risks at the animal-human interface: As Asia’s populations and incomes grow, so do disease risks

Global human population growth
Another presentation made by staff of the International Livestock Research Institute (ILRI) at the Asia Regional Livestock Policy Forum held in Bangkok last year (16–17 Aug 2012) (see previous posts on this News Blog about presentations made by ILRI director general Jimmy Smith and ILRI director Steve Staal) is one on ‘Human health risks at the animal-human interface’ by Joachim Otte, of the Food and Agriculture Organization of the United Nations (FAO), and ILRI veterinary epidemiologist Delia Grace.

Income growth in China and India

Their overview notes Asia’s growth in human populations and livestock food demands, the response from the livestock sector, the implications of those for infectious and parasitic disease dynamics and impacts, and the elements for a response.

They first showed the skyrocketing growth of livestock products in Asia.

Growth in poultry in Asia: 1990-2010

Poultry meat demand growth: 2000-2030

Dairy demand growth: 2000-2030

Then they reviewed the ecological consequences of the rising demand and production of livestock in Asia, which include:
• Land use change leads to habitat fragmentation and growing interfaces
• Expansion of irrigated areas provides new habitats for waterborne organisms and insect vectors
• Large, housed, rapid-turnover genetically homogenous farmed animal populations and heavy use of antimicrobials provide new eco-system and selective pressures
• Complex value chains provide novel disease transmission pathways

The presenters then outlined the use of antimicrobials and cost of antimicrobial resistance.

Anti-microbial use

Otte and Grace provided the estimated huge cost of SARS alone.

Cost of SARS

And they gave the estimated cost of newly emerging zoonoses (diseases shared by animals and people).

Cost of 'new' zoonoses

View the full presentation: Human health risks at the animal-human interface, presented by Joachim Otte and Delia Grace at an Asia Regional Livestock Policy Forum held in Bangkok, 16–17 Aug 2012, and organized by ILRI, the United Nations Food and Agriculture Organization (FAO) and the Animal Production and Health Commission for Asia and the Pacific (APHCA).

Background information and related links
Increasing livestock production to meet rapidly growing demands in a socially equitable and ecologically sustainable manner is becoming a major challenge for the Asia-Pacific region. To discuss the challenges and a practical response, the United Nations Food and Agriculture Organization (FAO), together with the International Livestock Research Institute (ILRI) and the Animal Production and Health Commission for Asia and the Pacific (APHCA) organized a Regional Livestock Policy Forum in Bangkok 16–17 Aug 2012.

The Asia and Pacific region has experienced the strongest growth in milk and meat over the last two to three decades. In three decades (1980 to 2010), total consumption of meat in the region grew from 50 to 120 million tonnes, and milk consumption grew from 54 to 190 million tonnes. By 2050, consumption of meat and milk in the region is projected to exceed 220 and 440 million tonnes, respectively. While this growth is creating new opportunities and better diets for many poor people, managing it will be a tall order and involve: stimulating income and employment opportunities in rural areas, protecting the livelihoods of small farmers, improving resource use efficiency at all levels of the livestock value chain, minimizing any negative environmental and health consequences of the growth, and ensuring adequate access by the poor to the food they need to live healthy lives.

The Aug 2012 Regional Livestock Policy Forum was held to find solutions. The 80 stakeholders in livestock development who attended represented governments, research agencies, civil society and multilateral organizations, think tanks, private-sector industries and regional and global networks.

View a slide presentation at the same Bangkok Forum made by ILRI director general Jimmy Smith, Health at the livestock-policy interface, and/or watch this 25-minute filmed presentation of his presentation.

See another slide presentation made at the Bangkok Forum, Poverty, food security, livestock and smallholders, by ILRI’s Steve Staal and FAO’s Vinod Ahuja.

Presentations made at the meeting, a detailed program and a list of participants are available here.

Get the proceedings of the whole conference: Asian Livestock Sector: Challenges, Opportunities and the Response — Proceedings of an international policy forum held in Bangkok, Thailand, 16–17 August 2012. Animal Production and Health Commission for Asia and the Pacific, International Livestock Research Institute and the Food and Agriculture Organization of the United Nations, 2013.

For more information, please contact:
Vinod Ahuja, FAO livestock policy officer, based in Bangkok: Vinod.Ahuja [at] fao.org
or
Purvi Mehta, Head of ILRI Asia, based in New Delhi: p.mehta [at] cgiar.org