Mosquito-Borne Diseases Update, New Hampshire, 2021
On June 28, 2021, NH DHHS issued a health alert regarding mosquito-borne diseases in NH in 2021.
Key Points and Recommendations:
- The first ever detection of Jamestown Canyon virus (JCV) in a mosquito has been detected from a batch of Aedes excrucians collected on 6/8/2021 in Bow, NH. During the 2020 season, one human case of JCV was identified in Bow.
- Three different mosquito-transmitted infections can be acquired in New Hampshire: West Nile Virus (WNV), Eastern Equine Encephalitis Virus (EEEV), and JCV.
- 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.
- Clinicians should consider testing for WNV, EEEV, and JCV, especially in patients hospitalized with signs or symptoms of meningitis or encephalitis (e.g. confusion or altered mental status).
- Testing for Powassan (POW) virus (a tickborne viral infection) should also be considered in patients presenting with unexplained neurologic illness.
- 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).
- Clinicians should contact their reference laboratories for mosquito-borne disease testing for the 2021 season. DPHS will continue to coordinate testing for POW and JCV as well as confirmatory testing for EEEV and WNV through the CDC.