Editing Rift Valley fever (section)

==Signs and symptoms==
In humans, the virus can cause several syndromes. Usually, they have either no symptoms or only a mild illness with fever, [[headache]], [[myalgia|muscle pains]], and [[liver]] abnormalities. In a small percentage of cases (< 2%), the illness can progress to [[hemorrhagic fever]] syndrome, [[meningoencephalitis]] (inflammation of the brain and [[meninges|tissues lining the brain]]), or affect the eye. Patients who become ill usually experience fever, generalised weakness, back pain, dizziness, and weight loss at the onset of the illness. Typically, people recover within two to seven days after onset. About 1% of people with the disease die of it. In livestock, the fatality level is significantly higher. Pregnant livestock infected with RVF [[abortion|abort]] virtually 100% of foetuses. An [[epizootic]] (animal disease epidemic) of RVF is usually first indicated by a wave of unexplained abortions.{{Citation needed|date=July 2020}}

Other signs in livestock include vomiting and diarrhea, respiratory disease, fever, lethargy, anorexia, and sudden death in young animals.<ref name="WikiVet">[http://en.wikivet.net/Rift_Valley_Fever Rift Valley Fever] {{webarchive|url=https://web.archive.org/web/20120508121622/http://en.wikivet.net/Rift_Valley_Fever |date=2012-05-08 }} reviewed and published by [[WikiVet]], accessed 12 October 2011.</ref>