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What is West Nile virus?
West Nile virus is a viral infection that is spread by the bite of an infected mosquito. Mosquitoes get
infected with the West Nile virus by feeding on infected birds. The infected mosquitoes then spread
the virus by biting humans and other animals, such as horses. Identified in the United States in
1999, West Nile virus is seen most often during the summer and early fall months.
FAQ and Tips About West Nile Virus