Another case of Eastern Equine Encephalitis Virus, or EEE, has been detected in a horse, this time in Northwood, according to the state Department of Health.
Epsom, as a result, raised its arboviral risk to moderate from low, the town said in an email that went out to residents Tuesday afternoon.
A Hampstead resident died late last month, the first human case since 2014, when three people were infected and two died.
EEE is a rare mosquito-borne virus. About a third of people who develop encephalitis from the virus die.
An earlier version of this story said the case was in a human. The story has since been updated.