NH DHHS Identifies Positive Test for EEE in a Horse in Derry New Positives Lead to Increase in Public Risk

Concord, NH - The New Hampshire Department of Health and Human Services

(DHHS) today announces a positive test result for eastern equine

encephalitis (EEE) in a horse from Derry as well as a mosquito batch in

Sandown and a mosquito batch positive for West Nile virus in Hampstead.

These findings necessitate the elevation of the risk level in Derry to

“High.” Towns surrounding Derry will be raised to a “Moderate” risk level.

“These results highlight the fact that these illnesses affect not just

mosquitoes, but animals and of course people too,” said Dr. José Montero,

Public Health Director at DHHS. “It is also an indication that mosquitoes

do not respect borders, and as a result can infect animals and people in

any corner of our State. This follows closely our identification of a

person with West Nile virus in Chesterfield so I want to reiterate the

importance of protecting against mosquito bites no matter where you live

until there is a killing frost statewide.”

So far this season New Hampshire’s Public Health Lab has tested 4,263

batches of mosquitoes. Of those, 10 have tested positive for WNV and 13

tested positive for EEE. One person was also diagnosed with WNV. The test

results being announced today are the first animal found positive for EEE

this season and there have been no positive tests for animals with WNV.

EEE is a serious disease that carries a high mortality rate for those who

contract the serious encephalitis form of the illness. Symptoms may include

high fever, severe headache, and stiff neck. There is no treatment for the

disease, which can lead to seizures and coma. Symptoms usually occur 4 to

10 days after being bitten. Symptoms of WNV disease often appear 4 to 10

days after being bitten. If you or someone you know is experiencing

flu-like symptoms, including fever and headache, contact your local medical


Questions about EEE and WNV can be answered by calling the toll free

EEE/West Nile Virus information line at 1-866-273-6453. You can also find

extensive information about both diseases on our website www.dhhs.nh.gov .

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