|Tick Prevention Poster|
What is ehrlichiosis?
Ehrlichiosis is a disease of humans and animals caused by bacteria named Ehrlichia. The bacteria, which are transmitted by ticks, can infect certain types of white blood cells.
Cases of ehrlichiosis have been confirmed in many states in this country, including Illinois.
How do you get ehrlichiosis?
The bacteria are transmitted to humans by the bite of an infected tick. The lone star tick, the American dog tick (or wood tick) and the deer tick (or black-legged tick) have been associated with ehrlichiosis.
Who gets ehrlichiosis?
Anyone is susceptible to the disease, but persons who spend time outdoors in tick-infested environments are at increased risk of exposure. In the Midwest, risk of exposure is greatest from spring through late autumn, but some ticks can become active any time of year if the temperature is warm enough (about 40 degrees Fahrenheit or more at ground level).
What are the symptoms of ehrlichiosis?
Illness due to ehrlichiosis can be so mild that no medical care is sought or the illness can be severe and sometimes fatal. Symptoms are generally non-specific and other diagnoses may be considered. The more common complaints are fever, headache and muscle aches. Persons with ehrlichiosis also may experience loss of appetite, nausea and vomiting. A rash can occur but is usually not present.
How soon do symptoms occur?
Symptoms typically begin between one and three weeks after exposure. Any person experiencing illness with a fever following a tick bite should consult his or her physician and advise the physician of the tick bite.
How is ehrlichiosis diagnosed?
If the symptoms of an illness suggest ehrlichiosis, special blood tests can be performed to detect the Ehrlichia agent itself or the presence of antibodies against the bacterium. Certain other laboratory tests can suggest a diagnosis of ehrlichiosis. These include a low white blood cell count, low blood sodium level and certain elevated liver function tests.
What is the treatment for ehrlichiosis?
The disease responds well to treatment with doxycycline or other tetracyclines. And, fortunately, diseases due to other tickborne agents--Rocky Mountain spotted fever and Lyme disease--also respond to these drugs. Treatment with antibiotics should be considered if ehrlichiosis is suspected because delayed treatment while awaiting laboratory confirmation of the disease may increase the risk for adverse outcomes.
How can ehrlichiosis be prevented?
Persons spending time outdoors in tick-infested areas should take precautions against all tickborne diseases:
How should an attached tick be removed?
Grasp the tick as close to the skin's surface as possible with tweezers and pull straight back in a slow, steady motion without twisting. Avoid crushing the tick's body because it may contain infectious fluid. If you do not have tweezers, you can use your fingertips but they should be covered (with tissue paper or gloves). After the tick is removed, wash the bite site and your hands with soap and water and apply a disinfectant or antibiotic ointment to the site.
of Public Health
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Springfield, Illinois 62761
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