The New Hampshire Department of Health and Human Services has notified the Salem Health Officer that a batch of mosquitoes collected in Salem tested positive for Jamestown Canyon virus, also known as JCV. This is Salem’s first reported detection of the virus and the first detection of a mosquito-borne virus in the community in several years.

Jamestown Canyon virus is transmitted through the bite of an infected mosquito. Although anyone who is bitten may potentially be exposed, the risk of infection and serious illness is considered low. Salem’s arboviral risk level has been increased from baseline to low.

Many people infected with JCV experience no symptoms or only mild illness. Early symptoms may include fever, headache, muscle aches, fatigue, or other flu-like symptoms. In rare cases, the virus can cause more serious illnesses affecting the central nervous system, including meningitis or encephalitis. Anyone experiencing concerning symptoms should contact a medical provider.

Residents and visitors are encouraged to continue taking precautions against mosquito and tick bites throughout the summer and fall:

1. Remove standing water from containers, gutters, birdbaths, pools, and other outdoor areas.
2. Wear long sleeves, long pants, and socks when spending time outdoors.
3. Use an appropriate insect repellent according to the product’s directions.
4. Make sure doors and windows have properly fitted screens.
5. Check yourself, children, and pets for ticks after spending time outdoors.
6. Shower and wash or dry clothing after outdoor activities.

Risk from other mosquito-borne illnesses, including Eastern Equine Encephalitis and West Nile virus, may also increase through the summer and fall while mosquitoes remain active.

For questions, contact the Salem Health Officer, Brian Lockard, at 603-890-2050 or the New Hampshire Division of Public Health Services’ Bureau of Infectious Disease Control at 603-271-4496.

Read the full press release and prevention guidelines here!