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West Nile fever: Here to stay and spreading

Cleveland Clinic Journal of Medicine. 2001 June;68(6):553-560
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ABSTRACT

The ultimate extent of West Nile virus's range in North America is uncertain but is likely to expand in 2001. Spread chiefly by night-biting Culex mosquitoes, the virus results in infection that most often is asymptomatic or causes a self-limited febrile illness. The elderly, however, are prone to develop neurologic manifestations, including potentially fatal encephalitis.