St. Louis encephalitis is caused by a virus. Mosquitoes are infected with this virus when they feed on birds. Infected mosquitoes can transmit the virus to humans and animals. St. Louis encephalitis is
spread from person to person.
Factors that may increase your chances of St. Louis encephalitis:
Living in or visiting the southern, central, or western US, especially during the
summer and fall
St. Louis encephalitis can result in a wide range of symptoms or produce no symptoms at all. The disease can be mild, severe, or even fatal.
Symptoms usually appear 5-15 days after the bite of an infected mosquito and may include:
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