Arboviral Illness Update - Manchester, NH

The NH DHHS issued a health alert on September 15 regarding detection of West Nile Virus (WNV) in a mosquito batch from Manchester, NH.  

NH Division of Public Health Services (NH DPHS) draws your attention to the following:

Key Points and Recommendations:

1. The first detection of West Nile Virus (WNV) in New Hampshire for 2015 has occurred in a mosquito batch from Manchester, NH.
2. Healthcare providers should not rely on the presence or absence of positive mosquito testing as a criterion for whether or not to test a patient for WNV or EEE.

  • Healthcare providers should consider mosquito-borne diseases, including West Nile Virus (WNV) and Eastern Equine Encephalitis (EEE), in patients with compatible clinical syndromes.
  • Laboratory testing may be arranged by calling 603-271-4496 during business hours or 1-800-852-3345 ext. 5300 after hours.
  • Forms and testing information are available at

3. Residents and visitors of NH are advised to use prevention measures to avoid mosquito bites, including wearing protective clothing, applying insect repellents, and reducing environmental mosquito populations.

  • Equine vaccines are available for both EEE and WNV and should be used to protect horses.
  • Vaccines for WNV and EEE are not available for human use.
  • Prevention measures used to prevent mosquito bites are also effective for preventing tick bites.

4. Healthcare providers should report suspected and confirmed cases of mosquito-borne diseases to the Bureau of Infectious Disease Control at 603-271-4496 (after hours 1-800-852-3345 ext. 5300).

Click here for the full DHHS Health Alert.