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 mosquitoes. It is one of the most severe mosquito-borne diseases in the US, with a case fatality rate of roughly 30%. NYS monitors EEE activity each summer in mosquito and bird populations.

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 susceptible.

Symptoms

Initial flu-like symptoms (fever, chills, malaise) followed rapidly by encephalitis: severe headache, high fever, stiff neck, and altered mental status. Onset is rapid; many survivors have significant neurological disability.

Who is at risk?

People who live near freshwater swamps, work outdoors, or recreate in wetland areas during mosquito season. Children, adults over 50, and immunocompromised individuals face the highest risk of severe disease.

What you can do

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

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

⚕️Seek immediate medical care for any sudden severe headache with fever

🛡Eliminate standing water around your home

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.