A person in New York has died of the mosquito-borne illness eastern equine encephalitis. This marked the first human case of EEE in the state since 2015.

The rare and deadly mosquito-borne illness known as Eastern equine encephalitis was identified in New York for the first time in over a decade last week and the person who contracted it has since died from the virus, the state’s governor announced Monday, making them the second person to die from the infection this season.

“While we normally see these mosquitoes in two to three counties each year, this year they have been in 15 counties so far, and scattered all over New York State. This life-threatening mosquito-borne disease has no commercially available human vaccine and must be taken seriously.