Mosquito-borne Diseases in NH 2018

On July 6, 2018, NH DHHS issued a health alert regarding mosquito-borne diseases in New Hampshire.

NH DPHS Health Alert NetworkKey Points and Recommendations:

1. Patients continue to be at risk for acquiring West Nile Virus (WNV) and Eastern Equine Encephalitis (EEE) in NH through the bite of an infected mosquito.

2. Jamestown Canyon Virus (JCV) is another mosquito-borne disease recently recognized as posing a risk to NH residents and visitors.

3. All three mosquito-borne diseases can cause a range of clinical symptoms including asymptomatic infection, non-specific febrile illness, and severe neurological disease including meningitis and encephalitis.

4. Clinicians should maintain an index of suspicion for these infections and consider testing patients presenting with a clinically compatible illness, especially patients presenting with an unexplained febrile neurologic illness.

5. Laboratory confirmation of WNV, EEE, and JCV can be arranged by calling (603) 271-4496 during business hours or (603) 271-5300 after hours. Forms and human testing information are available at

6. Clinicians should advise patients to avoid mosquito (and tick) bites by use of insect repellents, wearing protective clothing, and environmental reduction of mosquito populations.

7. Report all arboviral illnesses, confirmed or suspected, to the Division of Public Health Services (DPHS) within 24 hours at (603) 271-4496 (after hours 1-800-852-3345, x5300).

Read the full DHHS alert