Rift Valley Fever could spread with movement of animals from East Africa
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RVF is a per-acute or acute disease of domestic ruminants, caused by a mosquito-borne virus and characterised by hepatic necrosis and internal haemorrhages. The severity and degree of clinical signs may vary according to age or breeds of the animals affected, with infections usually unapparent or mild in adults but high mortality rates in new-born animals and abortions in pregnant animals . RVF is a zoonotic disease and humans become infected through contact with tissues of infected animals or m osquito bites. Infection in humans is usually associated with mild to moderately severe influenza-like illness, but severe complications such as retinal damage and blindness, encephalitis or haemorrhagic disease occur in about 1% of patients. The case fatality rate in humans can be considerable.