What is Eastern Equine Encephalitis (EEE)?

Aug. 28, 2024

A person in New Hampshire, United States, has died after contracting the rare mosquito-borne Eastern Equine Encephalitis (EEE) virus, health officials reported recently.

About Eastern Equine Encephalitis (EEE):

  • It is an extremely rare but serious and often fatal infection caused by the EEE virus (EEEV).
  • It causes encephalitis or inflammation of the brain.
  • EEEV can infect a wide range of animals, including mammals, birds, reptiles and amphibians. 
  • Transmission: The spread of EEEV to mammals (including humans and horses) occurs through the bite of infected mosquitoes that feed on both birds and mammals.
  • Human cases of EEE disease are rare but can cause serious illness.
  • Symptoms:
    • It is possible that some people who are infected with EEEV will not develop any symptoms. 
    • Symptoms typically appear 4-10 days after being bitten by an infected mosquito. 
    • Severe cases of EEE infection begin with the sudden onset of headache, high fever, chills, and vomiting that may progress into disorientation, seizures, encephalitis (inflammation of the brain), and coma.
  • About 30% of people ill from EEE die, and many who survive the infection are left with permanent neurologic damage.
  • Treatment:
    • There are no vaccines to prevent EEE infection in people and no specific treatments for EEE disease.
    • Treatment focuses on supportive therapy, including hospitalization, respiratory support, intravenous fluids, and prevention of other infections.

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