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What is West Nile Virus. West Nile virus (WNV) is spread by mosquitoes and can cause illness in people and animals. While 80% of human cases are asymptomatic, many people can develop West Nile fever.
What is West Nile Virus. West Nile virus (WNV) is spread by mosquitoes and can cause illness in people and animals. While 80% of human cases are asymptomatic, many people can develop West Nile fever.