Maine CDC Health Advisory

July 9, 2024

Arbovirus Update for Health Care Providers in Maine

Maine CDC recently confirmed that a mosquito pool (a batch of 1-50 mosquitoes) collected from Orono in Penobscot County tested positive for Jamestown Canyon virus. This is the first local mosquito pool to test positive for any arbovirus this year.

The purpose of this health advisory is to alert clinicians to the potential for human arboviral disease activity in Maine and to consider testing for mosquito-borne arboviruses in patients presenting with unexplained encephalitis, meningitis, or fever (100.4F or 38C) during the summer and fall, particularly among returning travelers.

Eastern Equine Encephalitis virus (EEE), West Nile virus (WNV), and Jamestown Canyon virus (JCV) are serious arboviral infections transmitted by the bite of an infected mosquito. All three viruses are endemic in Maine. Maine reported zero human cases of mosquito-borne arboviral illness in 2023. Although rare, these diseases can have severe and even fatal consequences for those who contract them.

Advisory (PDF)