NH DHHS Identifies Season’s First Positive Test For West Nile Virus In Mosquito Batch In Manchester

Concord, NH – The New Hampshire Department of Health and Human Services (DHHS) has identified the first batch of mosquitoes in 2019 to test positive for West Nile Virus (WNV). The batch was collected in the city of Manchester on August 21, 2019. DHHS is working with the City of Manchester Health Department to notify Manchester residents and those in the surrounding towns of the positive WNV test.

The Manchester Health Department continues its proactive surveillance program, which provides important and timely data that helps determine the risk level of mosquito-borne illness and the appropriate steps to protect the public’s health.

“This is the time of the season that we can expect West Nile Virus to be identified in New Hampshire,” said NH State Epidemiologist Dr. Benjamin Chan. “It is important for residents and visitors to take steps to prevent mosquito bites, as WNV and other arboviruses can be transmitted to humans from the bite of an infected mosquito. From this point in the season until there is a statewide mosquito-killing frost, the risk of infection by mosquito-borne viruses will increase. Use an effective mosquito repellent 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.”

WNV is an arbovirus transmitted from the bite of an infected mosquito. WNV was first identified in New Hampshire in August of 2000. Symptoms usually appear within a week after being bitten. Symptoms can include flu-like illness including fever, muscle aches, headaches, and fatigue. Many people may not develop any symptoms, or only develop very mild symptoms. A very small percentage of individuals infected with WNV can go on to develop more serious central nervous system disease, including meningitis or encephalitis. If you or someone you know is experiencing flu-like symptoms, including fever and headache, contact your local medical provider.