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On 27 August 2024, the New Hampshire Department of Health and Human Services (DHHS) reported a fatal case of eastern equine encephalitis (EEE).
According to the Centers for Disease Control and Prevention (CDC), EEE has also occurred in the States of Massachusetts, Vermont and Wisconsin in 2024.
EEE is caused by an alphavirus transmitted by mosquito bite, mainly in marshy and forested areas of the eastern United States. It is an uncommon infection but some years see increased case numbers.
Symptoms of EEE include fever, headache, vomiting, diarrhea, seizures, behavioral changes and drowsiness.
About 1 in 3 people who have EEE will die. There is no cure for the infection and only supportive treatment is available.
Advice to travellers
Travellers to endemic regions who may be engaging in outdoor work or recreational activity should practice rigorous insect bite avoidance at all times to reduce the risk of mosquito-borne infection.
Travellers who develop symptoms of EEE during or after travel should seek medical attention immediately and give details of their travel history.
