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Information for Health Care Providers
Maine CDC Health Advisory
June 30, 2025
Seasonal Arbovirus Updates for Health Care Providers
Eastern Equine Encephalitis virus (EEE), West Nile virus (WNV), and Jamestown Canyon virus (JCV) are all mosquito-borne viruses endemic to Maine. These infections can result in severe neurological disease and may be fatal. This advisory is intended to alert clinicians to the risk of human arboviral disease activity in Maine and provide information on prevention, testing, and reporting. Clinicians should consider mosquito-borne viruses in patients presenting with unexplained fever, meningitis, or encephalitis, particularly among individuals with outdoor exposure or recent travel to areas with known arboviral transmission. In addition to endemic viruses, clinicians should be aware of imported viruses like Chikungunya, Dengue, Oropouche, Yellow Fever, and Zika, particularly in returning travelers.
