A second person in New Hampshire has died of Eastern equine encephalitis, health officials said Wednesday.The Department of Health and Human Services said the Manchester adult died in mid-September and was the third human case of EEE this year. Officials said testing for the virus that causes EEE was complicated in this case, and a diagnosis wasn't made until the person died.The first fatal case of EEE was in Conway. A patient from Hopkinton was released from a hospital in September.In addition to the three human cases of EEE, two animals and 18 mosquito batches have tested positive for the mosquito-borne disease."Our sympathies are with the family of this individual as they grieve the unfortunate death of their loved one," said DHHS Public Health Director Dr. Jose Montero. "It is important that everyone in New Hampshire remember to continue to take steps in order to prevent mosquito bites to themselves and their loved ones until the season ends with a hard frost."Officials said the Manchester resident is thought to have been infected at the end of August. Symptoms of EEE often appear four to 10 days after someone is bitten by an infected mosquito, officials said.EEE causes flu-like symptoms, including high fever and a severe headache. Victims may also experience a stiff neck and sore throat. There is no specific treatment for the disease, which can lead to seizures and coma.