West Nile virus detected in New Hampshire for first time this season, health officials say

A mosquito batch recently found in Manchester tested positive for the virus.

“The best way to prevent WNV and other mosquito-transmitted infections is to take steps to avoid mosquito bites by using an insect repellent effective against mosquitoes, avoid being outdoors between dusk and dawn when mosquitoes are most active, and remove any standing water from around the home, where mosquitoes reproduce,” Dr. Benjamin Chan, the state epidemiologist, said.

The virus, which can be transferred to humans through the bite of an infected mosquito, was first identified in the state in 2000. Officials said it has been identified in the state each year over the last decade. The last human case of West Nile virus in New Hampshire was in an adult in 2017, officials said.

West Nile virus symptoms include flu-like illness, fever, headache, muscle aches and fatigue. A very small percentage of West Nile virus-infected people experience serious illness, including meningitis or encephalitis, health officials said.

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