Microsoft word - eee fs 2007 _2_.doc
PUBLIC HEALTH Eastern Equine
Massachusetts Department of Public Health (MDPH), 305 South Street, Jamaica Plain, MA 02130
What is Eastern Equine Encephalitis?
Eastern equine encephalitis (EEE) is a rare but serious disease caused by a virus.
How is the EEE virus spread?
The virus that causes EEE is spread through the bite of an infected mosquito. In Massachusetts, the virus is most often identified in mosquitoes found in and around freshwater, hardwood swamps. More information about different types of mosquitoes that can spread the virus can be found on the MDPH website at www.mass.gov/dph/wnv/wnv1.htm. EEE virus particularly infects birds, often with no evidence of illness in the bird. Mosquitoes become infected when they bite infected birds. Although humans and several other types of mammals, particularly horses and llamas, can become infected, they do not spread disease.
How common is EEE in Massachusetts?
EEE is a very rare disease. Since the virus was first identified in Massachusetts in 1938, fewer than 100 cases have occurred. Over 60% of those cases have been from Plymouth and Norfolk counties. Outbreaks of EEE usually occur in Massachusetts every 10-20 years. These outbreaks will typically last two to three years. The most recent outbreak of EEE in Massachusetts began in 2004 and included 13 cases with six fatalities through 2006.
What are the symptoms of EEE?
The first symptoms of EEE are fever (often 103º to106ºF), stiff neck, headache, and lack of energy. These symptoms show up three to ten days after a bite from an infected mosquito. Inflammation and swelling of the brain, called encephalitis, is the most dangerous and frequent serious complication. The disease gets worse quickly and some patients may go into coma within a week.
What is the treatment for EEE?
There is no treatment for EEE. In Massachusetts, about half of the people identified with EEE died from the infection. People who survive this disease will often be permanently disabled. Few people recover completely.
What can you do to protect yourself from EEE?
Since the virus that causes EEE is spread by mosquitoes, here are some things you can do to reduce your chances of being bitten:
• Schedule outdoor events to avoid the hours between dusk and dawn, when mosquitoes are most
• When you are outdoors, wear long pants, a long-sleeved shirt and socks. This may be difficult to do
when the weather is hot, but it will help keep mosquitoes away from your skin.
• Use a repellent with DEET
(N, N-diethyl-m-toluamide), permethrin, picaridin
(KBR 3023), or oil
of lemon eucalyptus
[p-methane 3, 8-diol (PMD)] according to the instructions given on the
product label. DEET products should not be used on infants under two months of age and should be
used in concentrations of 30% or less on older children. Oil of lemon eucalyptus should not be used
on children under three years of age. Permethrin products are intended for use on items such as
clothing, shoes, bed nets and camping gear and should not be applied to skin. More information on
choosing and using repellents safely is included in the MDPH Fact Sheet on Mosquito Repellents
which can be viewed online at www.mass.gov/dph/cdc/factsheets/factsheets.htm. If you can’t go
online, contact the MDPH at (617) 983-6800 for a hard copy.
• Keep mosquitoes out of your house by repairing any holes in your screens and making sure they are
tightly attached to all your doors and windows.
• Remove areas of standing water around your home. Here are some suggestions:
¾ Look around outside your house for containers and other things that might collect water and turn
them over, regularly empty them, or dispose of them.
¾ Drill holes in the bottom of recycling containers that are left outdoors so that water can drain out. ¾ Clean clogged roof gutters; remove leaves and debris that may prevent drainage of rainwater. ¾ Turn over plastic wading pools and wheelbarrows when not in use. ¾ Change the water in birdbaths every few days; aerate ornamental ponds or stock them with fish. ¾ Keep swimming pools clean and properly chlorinated; remove standing water from pool covers. ¾ Use landscaping to eliminate standing water that collects on your property.
Did you know?
Mosquitoes can begin to multiply in any puddle or standing water that lasts for more than four days!
Mosquito breeding sites can be anywhere. Take action
to reduce the number of mosquitoes around your
home and neighborhood. Organize a neighborhood clean up day to pick up containers from vacant lots
and parks and to encourage people to keep their yards free of standing water. Mosquitoes don't care about
fences, so it's important to remove areas of standing water throughout the neighborhood.
Need more information?
• EEE and personal protection:
MDPH, Division of Epidemiology and Immunization at 617-983-6800
or online at www.mass.gov/dph/wnv/wnv1.htm. You may also contact your local board of health (listed in the telephone directory under “government”).
• Mosquito control in your city or town
: Mosquito control in Massachusetts is conducted through
nine mosquito control districts. The State Reclamation and Mosquito Control Board (SRMCB)
oversees all nine districts. Contact information for each district can be found online at
www.mass.gov/agr/mosquito/districts.htm. You may also contact the SRMCB within the
Massachusetts Department of Agricultural Resources at 617-626-1777 or your local board of health.
• Health effects of pesticides
: MDPH, Center for Environmental Health at 617-624-5757
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