Eastern Equine Encephalitis Virus – Hamilton Resident Case Reported
- The City of Hamilton Public Health Services has confirmed a human case of Eastern Equine Encephalitis (EEE) in an adult resident of Hamilton, Ontario, as of August 31,...
- EEE is a rare but perhaps fatal viral disease transmitted through the bite of infected mosquitoes.
- Prior to the confirmed human case, two cases of EEE were identified in horses within the City of Hamilton.
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Confirmed Case of Eastern Equine Encephalitis (EEE) in Hamilton, Ontario
what is Eastern Equine encephalitis (EEE)?
The City of Hamilton Public Health Services has confirmed a human case of Eastern Equine Encephalitis (EEE) in an adult resident of Hamilton, Ontario, as of August 31, 2025. The resident has no known recent travel history, indicating local transmission. This marks the frist human case reported to Hamilton Public Health Services in 2025.
EEE is a rare but perhaps fatal viral disease transmitted through the bite of infected mosquitoes. The virus is typically maintained in a cycle between birds and mosquitoes.Humans and horses can become infected when bitten by a mosquito that has previously fed on an infected bird.
Recent Cases in Hamilton
Prior to the confirmed human case, two cases of EEE were identified in horses within the City of Hamilton. One of these equine cases was confirmed on August 18, 2025. The presence of EEE in the horse population indicates the virus is circulating locally.
Symptoms and Risks
Symptoms of EEE in humans can range from mild flu-like illness to severe neurological disease. According to the Public Health Agency of Canada, symptoms typically appear 4 to 10 days after a mosquito bite.
- Mild Cases: Fever, headache, chills, and malaise.
- Severe Cases: High fever, severe headache, disorientation, seizures, and coma. Severe cases have a high mortality rate (approximately 30%) and can result in long-term neurological damage in survivors.
The risk of EEE infection is generally low, but individuals who spend time outdoors in areas where mosquitoes are present are at increased risk.
Prevention and Protection
Hamilton Public Health Services recommends the following measures to protect against mosquito bites:
- Use insect repellent containing DEET, icaridin, or oil of lemon eucalyptus, following product instructions.
- Wear light-colored, long-sleeved shirts and pants when outdoors.
- Reduce standing water around your property, as this is where mosquitoes breed (e.g., empty flower pots, bird baths, and gutters).
- Ensure window and door screens are in good repair.
there is no vaccine available for EEE in humans. Vaccines are available for horses, and horse owners are encouraged to consult with their veterinarian about vaccination.
Timeline of EEE Cases in Hamilton (2025)
| Date | Event |
|---|---|
| august 18, 2025 | First equine case of EEE confirmed in Hamilton. |
| August 31, 2025 | First human case of EEE confirmed in Hamilton. |