West Nile Virus. Timeline. 1937 First Case reported 1950 Virus studied in Egypt 1957 Outbreak in Israel 1960 Equine cases 1999 Appeared in US. World Wide. Africa West Asia Eastern Europe Middle East United States. New York. 1999 62 Human cases 7 deaths 2000 21 Human cases
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Less than 1% of infected develop into severe illness
Causes encephalitis (inflammation of the brain)
Rapid onset of severe headache
Muscle weaknessSerious Infection Symptoms