What is tularemia?
Tularemia, or rabbit fever, is a bacterial disease associated with
both animals and humans. Although many wild and domestic animals
can be infected, the rabbit is most often involved in disease
outbreaks. Tularemia is relatively rare in Illinois; five or fewer
cases are reported each year.
Who gets tularemia?
The disease occurs throughout the United States in all months of
the year. The incidence, however, is higher for adults in early
winter during rabbit hunting season and for children during the
summer when ticks and deer flies are abundant.
How is tularemia spread?
Many routes of human exposure to the tularemia bacteria are known
to exist. The common routes include inoculation of the skin or
mucous membranes with blood or tissue while handling infected
animals, the bite of an infected tick, contact with fluids from
infected deer flies or ticks, or handling or eating insufficiently
cooked rabbit meat. Less common means of spread are drinking
contaminated water, inhaling dust from contaminated soil or
handling contaminated pelts or paws of animals. Tularemia is not
spread from person to person.
What are the symptoms of tularemia?
Symptoms vary, depending on the route of introduction. In those
cases where a person becomes infected from handling an animal
carcass, symptoms can include a slow-growing ulcer at the site
where the bacteria entered the skin (usually on the hand) and
swollen lymph nodes. If the bacteria is inhaled, a pneumonia-like
illness can follow. Those who ingest the bacteria may report a
sore throat, abdominal pain, diarrhea and vomiting.
How soon do symptoms appear?
Symptoms can appear between one and 14 days after exposure, but
usually do so after three to five days.
What is the treatment for tularemia? The drug of choice for treating tularemia is
streptomycin or gentamicin, although other antibiotics also are
effective.
Does past infection with tularemia make a
person immune?
Long-term immunity usually follows recovery from tularemia.
However, reinfection has been reported.
What can be done to prevent the spread of
tularemia?
Several precautions can protect individuals from tularemia.
Avoid drinking, bathing, swimming or working in untreated water
where infection may be common among wild animals.
Use impervious gloves when skinning or handling animals,
especially rabbits.
Cook the meat of wild rabbits and rodents thoroughly.
Avoid being bitten by deer flies and ticks. The following
suggestions may help:
1. Check your clothing often for ticks climbing toward open skin.
Wear white or light-colored long-sleeved shirts and long pants so
the tiny ticks are easier to see. Tuck long pants into your socks
and boots. Wear a head covering or hat for added protection.
2. For those who may not tolerate wearing all of these clothes in
hot, muggy weather, apply insect repellent containing DEET (30
percent or less) to exposed skin (except the face). Be sure to
wash treated skin after coming indoors. If you do cover up, use
repellents containing permethrin to treat clothes (especially
pants, socks and shoes) while in locations where ticks may be
common. Follow label directions; do not misuse or overuse
repellents. Always supervise children in the use of repellents.
3. Walk in the center of trails so weeds do not brush against you.
4. Check yourself, children and other family members every two to
three hours for ticks. Most ticks seldom attach quickly and rarely
transmit tickborne disease until they have been attached for four
or more hours.
5. If you let your pets outdoors, check them often for ticks.
Infected ticks also can transmit some tickborne diseases to them.
(Check with your veterinarian about preventive measures against
tickborne diseases.) You are at risk from ticks that "hitch a
ride" on your pets but fall off in your home before they feed.
6. Make sure the property around your home is unattractive to
ticks. Keep your grass mowed and keep weeds cut.
How should an attached tick be removed?
Remove any tick promptly. Do not try to burn the tick with a match
or cover it with petroleum jelly or nail polish. Do not use bare
hands. The best way to remove a tick is to grasp it with
fine-point tweezers as close to the skin as possible and gently,
but firmly, pull it straight out. Do not twist or jerk the tick.
If tweezers are not available, grasp the tick with a piece of
cloth or whatever can be used as a barrier between your fingers
and the tick. You may want to put the tick in a jar of rubbing
alcohol labeled with the date and location of the bite in case you
seek medical attention and your physician wishes to have the tick
identified.
The mouthparts of a tick are shaped like tiny barbs and may remain
embedded and lead to infection at the bite site if not removed
properly. Be sure to wash the bite area and your hands thoroughly
with soap and water, and apply an antiseptic to the bite site.
Why is there concern about tularemia as a
bioweapon?
Tularemia, in aerosol form, is considered a possible bioterrorist
agent. Persons who inhale an infectious aerosol would likely
experience severe respiratory illness. Any suspected cases of
tularemia inhalation should be immediately reported to local and
state health departments.
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