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Eastern Equine Encephalitis Virus

Eastern equine encephalitis virus (EEEV) is a mosquito-borne virus that circulates between bird hosts and mosquito populations.

EEEV is transmitted by the bite of an infected mosquito, not directly from animal to person or person to person. Mammals may become infected with EEEV by a mosquito species that feeds on both birds and mammals.

EEEV has been detected in humans, horses, pigs, rodents, and white-tailed deer. The disease can be fatal if nervous system signs develop, however, clinical infections are rare. A vaccine is available for horses (for more information contact Board of Animal Health or your veterinarian).

People can reduce their risk from mosquitoes by:

  • Limiting skin exposure with shoes, socks, long sleeves, and pants, especially when mosquitoes are most active (from dusk until dawn)
  • Using EPA registered mosquito repellent
  • Treating clothes and outdoor gear with 0.5% permethrin
  • Removing standing water in and around homes

For questions related to human health risks from EEEV, visit the Indiana State Department of Health's webpage or read their EEEV Quick Facts.

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