NH DHHS Identifies First Positive Test Results of the Year for Eastern Equine Encephalitis

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

(DHHS) is announcing that one batch of mosquitoes from Londonderry tested

positive for Eastern Equine Encephalitis Virus (EEE). This is the first

finding of EEE in the State this year. There have not been any positives

identified for West Nile Virus so far this season in New Hampshire. In

2013, there were 27 positives for EEE, including 24 mosquito batches and 3


EEE and WNV are transmitted by the bite of infected mosquitos. This finding

does not change the current low arboviral risk level for Londonderry. It is

important that people continue to take precautions against mosquito bites

including wearing an effective repellent, long pants and sleeves, ensuring

screens are in good repair and removing standing water from your property

to prevent mosquitoes from breeding.

“This is approximately the same time we identified the first positive for

Eastern Equine Encephalitis as last year,” said Public Health Director Dr.

José Montero. “Since we know that the agents that cause these diseases are

here in New England, everyone should make it part of their routine to take

precautions every time they go outside.”

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 provider. EEE is a more 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, stiff neck, and sore throat. There is no treatment for the

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

10 days after being bitten.

For more information about EEE and West Nile Virus visit the DHHS website

at http://www.dhhs.nh.gov/dphs/cdcs/arboviral/index.htm and the Centers for

Disease Control and Prevention website at www.cdc.gov . For questions

contact the DHHS Bureau of Infectious Disease Control at 603-271-4496.

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Prevention Guidelines for West Nile Virus and

Eastern Equine Encephalitis Virus

NH Department of Health and Human Services, Division of Public Health


1. Eliminate standing water and other mosquito breeding locations.

In warm weather, mosquitoes can breed in any puddle that lasts more than 4


Remove old tires from your property.

Dispose of tin cans, plastic containers, ceramic pots, or other

containers. Don’t overlook containers that have become overgrown

by aquatic vegetation.

Drill holes in the bottom of recycling containers that are left


Make sure roof gutters are clean and draining properly.

Clean and chlorinate swimming pools and hot tubs. If not in use,

keep empty and covered and keep covers free of standing water.

Aerate garden ponds or stock them with fish.

Turn over wheelbarrows and change water in birdbaths at least

twice weekly.

Turn over plastic wading pools when not in use.

Remind or help neighbors to eliminate breeding sites on their


2. Be aware of where mosquitoes live and breed and keep them from entering

your home.

Mosquitoes lay their eggs in standing water. Weeds, tall grass, and

bushes provide an outdoor home for adult mosquitoes, including

several species commonly associated with West Nile Virus and Eastern

Equine Encephalitis Virus.

Mosquitoes can enter homes through unscreened windows or doors, or

broken screens. Make sure that doors and windows have tight-fitting

screens. Repair or replace all screens in your home that have tears

or holes.

Resting mosquitoes can often be flushed from indoor resting sites by

using sweeping motions under beds, behind bedside tables etc. and

once in flight, exterminated prior to sleeping at night.

3. Protect yourself from mosquito bites.

If outside during evening, nighttime, and dawn hours when mosquitoes

are most active and likely to bite, children and adults should wear

protective clothing such as long pants, long-sleeved shirts, and


Consider the use of an effective insect repellent, such as one

containing DEET. A repellent containing 30% or less DEET

(N,N-diethyl-methyl-meta-toluamide) for children and adults. Use DEET

according to the manufacturer's directions. Children should not apply

DEET to themselves. Repellents that contain Picaridin or oil of lemon

eucalyptus have also been determined to be effective.

Vitamin B, ultrasonic devices, incense, and bug zappers have not been

shown to be effective in preventing mosquito bites.

For more information on West Nile Virus or Eastern Equine Encephalitis

Virus, call the NH Department of Health and Human Services toll-free West

Nile Virus Information Line at

866–273–NILE (6543), or visit the West Nile Virus Website at