West Nile Virus Detected In Mosquito Batch In Manchester

MANCHESTER, NH — A batch of mosquitos collected in Manchester last week has tested positive for West Nile Virus, the Manchester Health Department announced Tuesday.

While it is the first positive batch in Manchester this season, mid-July is a normal time for the virus to be detected in mosquitos in the area, officials added.

From this point in the season until there is a mosquito-killing frost, the risk of infection by mosquito-borne viruses may increase — meaning now is the time to be taking steps to prevent mosquito bites, Manchester's public health director Anna Thomas said.

"Use an effective mosquito repellant that contains 30% DEET, avoid being outdoors at dawn and dusk, and remove standing water from around the home, where mosquitos reproduce, to limit the risks of catching these infections," Thomas added.

West Nile virus, which was first identified in New Hampshire in August 2000, is transmitted through the bite of an infected mosquito, according to health officials. Symptoms can include flu-like illness like fever, muscle aches, headaches, and fatigue, and usually appear within a week after being bitten.

A very small percentage of people infected with West Nile virus can go on to develop more serious central nervous system disease, including meningitis or encephalitis, officials added. People with flu-like symptoms including fever and headache are urged to contact their doctor.

Meanwhile, many people who are bitten by infected mosquitos may not develop any symptoms, or experience only mild ones.

The Manchester Health Department is urging residents with concerns and questions about mosquito-borne viruses to call 624-6466 and ask to speak to the Environmental Health Branch.