West Nile Virus detected in Manchester mosquito batch

Paul Feely, The New Hampshire Union Leader, Manchester
·2 min read

Jul. 28—A batch of mosquitoes collected in Manchester on July 20 has tested positive for West Nile Virus, the state health department reported.

It's the first batch to test positive in the city this year.

State and city health officials are working together to provide additional risk mitigation information to Manchester residents and surrounding towns.

First identified in New Hampshire in 2000, West Nile Virus is one of three "arboviruses" transmitted by mosquitoes here. The others are Eastern Equine Encephalitis (EEE) and Jamestown Canyon virus (JCV).

Symptoms of West Nile infection usually appear within a week after a bite, causing flu-like illness including fever, muscle aches, headaches and fatigue.

Many people develop no symptoms or very mild symptoms, but a very small percentage of those infected can go on to develop more serious central nervous system disease, including meningitis or encephalitis, according to the state Department of Health and Human Services.

Prevention guidelines for West Nile Virus and other arboviruses include the following:

1. Eliminate standing water and other mosquito breeding locations. In warm weather, mosquitoes can breed in any puddle that lasts more than four days.

2. Be aware of where mosquitoes live and breed and keep them from entering your home. Mosquitoes can enter homes through unscreened windows or doors, or broken screens.

3. Protect yourself from mosquito bites. If outside during evening, nighttime, and dawn hours when mosquitoes are most active and likely to bite, children and adults should wear protective clothing such as long pants, long-sleeved shirts, and socks.

4. Consider the use of an effective insect repellent, such as one containing DEET.

Anyone with questions about arboviruses, including WNV, can call the New Hampshire Bureau of Infectious Disease Control at 603-271-4496. Fact Sheets on West Nile virus and other arboviruses are available on the DHHS website.

For more information, visit the Centers for Disease Control and Prevention website at https://www.cdc.gov/westnile.