Rift Valley Fever
Rift Valley Fever (RVF) is caused by a virus transmitted by mosquitoes and blood feeding flies that usually affects animals (commonly cattle and sheep) but can also involve humans. In humans the disease ranges from a mild flu-like illness to severe haemorrhagic fever that can be lethal. When livestock are infected the disease can cause significant economic losses due to high mortality rate in young animals and waves of abortions in pregnant females.
The virus was first identified in 1931 during an epidemic among sheep on a farm in the Rift Valley of Kenya. Since then, outbreaks have been reported in sub-Saharan Africa, North Africa, and in 2000 Saudi Arabia and Yemen, marking the first reported occurrence of the disease outside the African continent, raising concerns that it could extend to other parts of Asia and Europe.
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