Louis encephalitis virus (SLEV)
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St. Louis encephalitis (SLE) is a rare mosquito-borne
arboviral disease transmitted to humans by the bite of an infected
mosquito. In the United States, most of SLE disease cases have occurred
in eastern and central states. Five cases of SLE have been reported in
Wisconsin between 1964 and 2000. Most persons infected with St. Louis
virus (SLEV) have no apparent illness. Symptoms of illness include
fever, headache, nausea, vomiting, and tiredness. Some people may have
neuroinvasive disease that often involve in encephalitis, an
inflammation of the brain.
St. Louis Encephalitis
fact sheet -
Centers for Disease Control and Prevention (CDC)
Data and Statistics on St. Louis Encephalitis - CDC
Some tips to protect yourself:
- Use effective mosquito repellant and apply according to the label
- Wear long-sleeved shirts, long pants, socks, and shoes.
- Mosquitoes may bite through thin clothing, so spraying clothes
with a repellent containing permethrin or DEET will give extra
protection. These repellants are the most effective and most studied.
- Avoid being outside during times of high mosquito activity,
specifically around dawn and dusk.
- Keep window screens repaired so that mosquitoes cannot enter your
- Dispose of discarded tires, cans, or plastic containers left
outside that may contain standing water.
- Drain standing water from pool or hot tub covers.
- Turn over plastic wading pools and wheel barrows when not in use.
- Change the water in bird baths, pet dishes and wading pools every
- Keep drains, ditches and culverts clean of trash and weeds so
water will drain properly.
- Clean gutters to ensure they drain
For more information,
Using Insect Repellants Safely - CDC
Information for health professionals
This is a Wisconsin Disease Surveillance Category II disease:
the patient's local public health department electronically, through the Wisconsin
Electronic Disease Surveillance System
(WEDSS), by mail or fax using an Acute and Communicable Disease Case
Report F-44151 (PDF,
167 KB) or by other means within 72 hours upon recognition of a
Communicable Disease Reporting
Wisconsin case reporting and public health follow-up
diseases EpiNet (PDF, 52 KB)
case report form (PDF, 46 KB)
2013 Arbovirus management protocol (PDF, 372 KB)
Local Health Departments - Regional offices - Tribal agencies
Diep Hoang Johnson
Vectorborne Disease Epidemiologist
Wisconsin Division of Public Health
Bureau of Communicable Diseases and Emergency Response
(Phone 608-267-0249) (Fax 608-261-4976)
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June 13, 2012