Eastern Equine Encephalitis (EEE) & West Nile Virus

Public Health EEE West Nile Virus

For more information on Mosquito-borne Disease and up to date information on testing, data, and the risk map please visit the Massachusetts Department of Public Health website: Mosquito-borne Diseases / Mass.govEastern Equine Encephalitis (EEE):

Eastern equine encephalitis (EEE)

EEE is an extremely rare, but serious, and often fatal infection that causes encephalitis or inflammation of the brain. It is transmitted through a bite from a mosquito. It takes 3 to 10 days after a bite from an infected mosquito to show symptoms. Symptoms include fever, headache, stiff neck, and lack of energy. Inflammation and swelling of the brain, (encephalitis) is the most severe and complicated symptom and can cause coma within a week. Those who survive will likely suffer permanent brain damage.

West Nile Virus (WNV)

West Nile Virus is a mosquito-borne illness that is contracted through the bite of a mosquito. People of all ages can become ill from WNV. However, people over 50 are at most risk for the disease. Most people infected with WNV develop no symptoms of the illness. Eight out of 10 people remain symptom-free once infected. Less than 1% of people develop serious illness that requires hospitalization and may cause death. Symptoms can include high fever, severe headache, stiff neck, disorientation, partial paralysis, convulsions and coma.

Protect Yourself and Your Family

  • Avoid going outdoors between dusk and dawn, peak mosquito time
  • Wear long pants and sleeves when outdoors
  • Wear an insect repellant containing DEET, permethrin, picaridin, or oil of lemon eucalyptus
  • Eliminate standing water from your yard
  • Install screens in windows and doors, and repair any holes in existing screens
  • Encourage your neighbors to do the same