A Norfolk County woman in her 80s has died of Eastern equine encephalitis. She was the first Massachusetts resident known to be infected this season with the often lethal mosquito-borne illness, state public health officials announced Tuesday.
The woman, who has not been identified, was hospitalized earlier this month and died a few days later.
Health officials said they are tracing the woman’s activity in recent weeks to determine where she may have been bitten by an infected mosquito and will determine whether to increase warning levels and urge cancellation of night-time activities based on their findings.
“We are right in the middle of peak transmission for EEE,” said Dr. Catherine Brown, state public health veterinarian. Full story for BostonGlobe.com subscribers.