Mosquito-borne Diseases, NH, 2019

On August 8, 2019, NH DHHS issued a health alert update on mosquito-borne diseases in New Hampshire.

KNH Division of Public Health Services Health Alert Networkey Points and Recommendations:

  1. Our first case of Jamestown Canyon Virus (JCV) infection this season has been identified in a New Hampshire (NH) resident who also tested positive for Powassan virus co-infection. 
  2. Three different mosquito-transmitted infections can be acquired in New Hampshire: West Nile Virus (WNV), Eastern Equine Encephalitis (EEE), and JCV. 
  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 consider testing for WNV, EEE, and JCV, especially in patients hospitalized with signs or symptoms of meningitis or encephalitis (e.g. confusion or altered mental status).
  5. Testing for Powassan virus (a tickborne viral infection) should also be considered in patients presenting with unexplained neurologic illness. For more information about Powassan and other tickborne disease (TBDs), please refer to our earlier HAN.
  6. Report all suspect or confirmed arboviral illnesses to the Division of Public Health Services (DPHS) within 24 hours at 603-271-4496 (after hours 603-271-5300 and ask for the public health nurse on call). We can help to facilitate confirmatory testing through our public health laboratories.

Full DHHS Alert