New Hampshire resident dies after contracting mosquito-borne encephalitis virus

New Hampshire last saw an Eastern Equine Encephalitis infection in 2014

A New Hampshire resident has died after testing positive for Eastern Equine Encephalitis virus.

The deceased was identified only as an adult from Hampstead, the New Hampshire Department of Health and Human Services Division of Public Health Services said on Tuesday. The resident had been hospitalized with the severe central nervous system disease.

“We believe there is an elevated risk for EEEV infections this year in New England given the positive mosquito samples identified,” State Epidemiologist Dr. Benjamin Chan said.

“The risk will continue into the fall until there is a hard frost that kills the mosquitos. Everybody should take steps to prevent mosquito bites when they are outdoors.”

A Cattail mosquito is held up for inspection at the Maine Medical Center Research Institute in South Portland. New Hampshire saw its first case of the mosquito-borne Eastern Equine Encephalitis this week. ((AP Photo/Pat Wellenbach, File))

The last reported Eastern Equine Encephalitis infection in the state was ten years ago. The department identified three infections in 2014 which resulted in two deaths.

Eastern Equine Encephalitis cases have also been reported in neighboring Massachusetts and Vermont. A Massachusetts man in his eighties was hospitalized earlier this month after being exposed to the virus in Worcester County. The Massachusetts Department of Public Health declined to provide further details on the case due to patient privacy. In Vermont, a Chittenden County man in his forties was hospitalized on July 16. He left the hospital a week later.

This year, a total of four cases of Eastern Equine Encephalitis have been confirmed by the Centers for Disease Control and Prevention, including in Wisconsin and New Jersey. That tally did not yet include the New Hampshire case.

Only a handful of cases are reported each year, and infection is very serious. Eastern Equine Encephalitis can lead to inflammation of the brain and membranes around the spinal cord.

Approximately 30 percent of those infected with the virus die, and those who survive, are often left with neurologic problems. There are no vaccines or medicines to treat or prevent the disease.

A mosquito sits on human skin. Infected mosquitoes pass the virus to humans, with severe consequences including death. ((James Gathany/CDC via AP))

These recent cases have resulted in insecticide treatments in Massachusetts towns and across New York City boroughs. New York has not reported any cases of Eastern Equine Encephalitis. Health departments in both states said they would use an insecticide called Anvil 10+10. New York City is also using two others, Duet and MERUS 3.

The insecticide would be sprayed on the ground using trucks in both states. The Massachusetts Department of Health also warned residents that they would use small aircrafts to spray from the sky.

Massachusetts has implemented other measures aimed to protect residents, including a voluntary curfew in some towns, and closing parks and fields from dusk until dawn.