New York Reports EEE Death, First State Case in Nearly a Decade; Officials Urge Mosquito Precautions

One person diagnosed with eastern equine encephalitis in Ulster County has died.
Mosquitoes, once a nuisance, are now a threat.
State Health Commissioner Dr. James McDonald on why New York is treating EEE seriously this year.

In late September, New York learned of a death that had not occurred in the state for nearly ten years: a resident of Ulster County, on the Hudson, lost to eastern equine encephalitis, a mosquito-borne illness for which no vaccine exists for people. The news arrives in a season that feels like an ending but is not yet one, since the insects that carry the virus keep their work until the cold settles in for good. It is a reminder that the small, familiar annoyance of the summer mosquito can carry a far graver weight, and that the boundary between nuisance and danger can shift quietly across a landscape.

On a Monday in late September, Governor Kathy Hochul's office announced that a person in Ulster County had died of eastern equine encephalitis, the first human case the state had recorded in nearly ten years. The state Department of Health had confirmed the diagnosis on September 20, and the county's own health department has now taken up the investigation. What is not yet known is who the person was, how old they were, or where the bite that carried the virus may have happened. Those answers have not been made public.

Before the death was announced, State Health Commissioner Dr. James McDonald had already declared an Imminent Threat to Public Health. That declaration allows the state to bring in resources, including mosquito spraying, over a window running from September 30 through November 30.

McDonald placed the case within a wider pattern. In a typical year, the virus-carrying mosquitoes appear in two or three counties; this year they have turned up in fifteen. He called the disease life-threatening and reminded people that no vaccine for humans is commercially available. His advice was practical: use repellent, cover up with long sleeves, and empty standing water around the home. Mosquitoes, he noted, stay active until several nights of below-freezing weather, so the risk outlasts the change of season.

The story is still developing. Watch the county's investigation, the start of spraying, and whether the count of affected counties keeps rising before the hard freeze arrives.

On Monday, Gov. Kathy Hochul's office announced that a person in Ulster County, New York, had died of eastern equine encephalitis, known as EEE. It is the first person in the state to be diagnosed with the disease in nearly a decade.

The state Department of Health confirmed the case on Sept. 20. Ulster County sits along the Hudson River. The county's own Department of Health is now investigating the case. The source material does not say who the person was, how old they were, or where they may have been bitten, and those details remain unreported.

Before the death was announced, State Health Commissioner Dr. James McDonald had already issued a Declaration of an Imminent Threat to Public Health following the diagnosis. That declaration lets the state deploy resources, including mosquito spraying, over a defined window: Sept. 30 through Nov. 30, 2024.

McDonald's statement framed the diagnosis against a larger pattern. In a typical year, he said, the mosquitoes that carry the virus turn up in two or three New York counties. This year they have been found in 15 counties so far, scattered across the state. He described the disease as life-threatening and noted that there is no commercially available human vaccine for it. In his words, mosquitoes that were once a nuisance are now a threat.

The statement also carried practical advice. McDonald urged New Yorkers to prevent bites by using insect repellent, wearing long-sleeved clothing, and getting rid of standing water near their homes. He noted that although fall has officially arrived, mosquitoes will remain active until the state sees multiple nights of below-freezing temperatures. That means the risk does not end with the calendar change, and the spraying window runs well into late November.

The article was published as a developing story, with the outlet promising updates. For now, what readers can watch for is the county's investigation, the start of spraying on Sept. 30, and whether the 15-county detection count rises before a hard freeze ends the mosquito season.

While we normally see these mosquitoes in two to three counties each year, this year they have been in 15 counties so far.
— Dr. James McDonald, New York State Health Commissioner
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