Map shows states where West Nile virus has been detected in humans and mosquitos. The disease can cause a range of symptoms, from fever to brain swelling.

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At least 18 states have detected West Nile virus in mosquitoes or humans as of mid-July, according to the Centers for Disease Control and Prevention..

West Nile virus (WNV) is commonly spread from infected mosquitoes to humans throughout summer and fall, but only about one in five people infected with the virus experience symptoms of disease, the CDC says..

Local health departments are meant to report all human WNV disease cases to the CDC, but some states and counties report their mosquito surveillance data independently...

Several states have reported WNV in mosquitoes without any known infections in humans, as people in those areas should take precautions to avoid mosquito bites...

Local and state health departments regularly trap and test mosquitoes to monitor them for diseases, including WNV.At least 12 states including Florida, Massachusetts, and New York have detected WNV in mosquitoes but not in humans..

Full story at Insider | 

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