Mosquito-borne illnesses are spread to people by the bite of an infected mosquito. Examples include West Nile Virus (WNV) or Eastern Equine Encephalitis virus (EEEV). Typically, the season for West Nile Virus or other mosquito-borne illnesses is summer through early fall. As soon as mosquitoes are active, it's time to protect yourself.
Cases of Positive West Nile Virus Specimens (Birds, Mosquito Pools and Human Cases) in Boston-2009 (last updated 8/13/2009)