Eastern Equine Encephalitis

Clear→ stable

Vector-borneNeurological

Current NYS Status

No EEE activity detected in NYS yet this season. NYSDOH monitoring mosquito pools statewide.

Source: NYSDOH arboviral surveillance, updated weekly (seasonal)

What is it?

Eastern Equine Encephalitis (EEE) is a rare but serious viral disease spread by infected mosquitoes. It has one of the highest mortality rates of any mosquito-borne disease in the US — approximately 30% of cases are fatal, and many survivors have significant permanent neurological disability. NYSDOH monitors EEE activity in mosquito and bird populations across the state each summer.

How it spreads

Transmitted by the bite of infected mosquitoes, primarily Culiseta melanura in freshwater swamp habitats. Not spread person-to-person. Horses are also highly susceptible and often serve as sentinel animals for human risk.

Symptoms

Onset is rapid. Initial flu-like symptoms (fever, chills, malaise) are followed quickly by severe headache, high fever, stiff neck, and altered mental status. Progression to coma can occur within days.

Who is at risk?

People who live near freshwater swamps or wetlands, work or recreate outdoors in these habitats, and anyone who is immunocompromised or over 50 faces elevated risk of severe disease.

What you can do

🛡Use EPA-registered insect repellent whenever outdoors, especially near wetland or swamp areas

🛡Wear long sleeves and pants during dusk and dawn when Culiseta mosquitoes are most active

⚕️Seek immediate emergency care for any sudden severe headache combined with high fever

🛡Eliminate standing water around your property

Tier A — Real-time tracking

Surveillance data updated from government sources daily or weekly. Threat level reflects current wastewater signal or clinical reports.

Seasonality: summer

This information is for general public health awareness and is not a substitute for professional medical advice, diagnosis, or treatment.