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MMWR: Notes from the Field: Concurrent Outbreaks of St. Louis Encephalitis Virus and West Nile Virus

Thursday, December 10, 2015   (0 Comments)

St. Louis encephalitis virus (SLEV) and West Nile virus (WNV) are closely related mosquito-borne flaviviruses that can cause outbreaks of acute febrile illness and neurologic disease. Both viruses are endemic throughout much of the United States and have the same Culex species mosquito vectors and avian hosts (1); however, since WNV was first identified in the United States in 1999, SLEV disease incidence has been substantially lower than WNV disease incidence, and no outbreaks involving the two viruses circulating in the same location at the same time have been identified.


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