Rift Valley fever (RVF) is a vector-borne disease transmitted by a broad spectrum of mosquito species,
especially Aedes and Culex genus, to animals (domestic and wild ruminants and camels) and humans.
Rift Valley fever is endemic in sub-Saharan Africa and in the Arabian Peninsula, with periodic epidemics
characterised by 5–15 years of inter-epizootic periods. In the last two decades, RVF was notified in new
African regions (e.g. Sahel), RVF epidemics occurred more frequently and low-level enzootic virus
circulation has been demonstrated in livestock in various areas. Recent outbreaks in a French overseas
department and some seropositive cases detected in Turkey, Tunisia and Libya raised the attention of the
EU for a possible incursion into neighbouring countries. The movement of live animals is the most
important pathway for RVF spread from the African endemic areas to North Africa and the Middle East.
The movement of infected animals and infected vectors when shipped by flights, containers or road
transport is considered as other plausible pathways of introduction into Europe. The overall risk of
introduction of RVF into EU through the movement of infected animals is very low in all the EU regions
and in all MSs (less than one epidemic every 500 years), given the strict EU animal import policy. The
same level of risk of introduction in all the EU regions was estimated also considering the movement of
infected vectors, with the highest level for Belgium, Greece, Malta, the Netherlands (one epidemic every
228–700 years), mainly linked to the number of connections by air and sea transports with African RVF
infected countries. Although the EU territory does not seem to be directly exposed to an imminent risk of
RVFV introduction, the risk of further spread into countries neighbouring the EU and the risks of possible
introduction of infected vectors, suggest that EU authorities need to strengthen their surveillance and
response capacities, as well as the collaboration with North African and Middle Eastern countries.
Nielsen, S.S., Alvarez, J., Bicout, D.J., Calistri, P., Depner, K., Drewe, J.A., Garin-Bastuji, B., Rojas, J.L.G., Schmidt, C.G., Michel, V., Chueca, M.A.M., Roberts, H.C., Sihvonen, L.H., Stahl, K., Calvo, A.V., Viltrop, A., Winckler, C., Bett, B., Cetre-Sossah, C., Chevalier, V., Devos, C., Gubbins, S., Monaco, F., Sotiria-Eleni, A., Broglia, A., Abrahantes, J.C., Dhollander, S., Stede, Y. Van Der and Zancanaro, G. 2020. Rift Valley Fever – epidemiological update and risk of introduction into Europe. EFSA Journal 18(3): e06041.