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What You Need to Know: FAQs & Handouts

What causes La Crosse Encephalitis?

The disease is caused by a virus (La Crosse virus) that is transmitted by the bite of a mosquito.

What is Encephalitis?
Encephalitis is an inflammation of the brain (encephalon = brain).

Additional information about La Crosse Encephalitis (including maps and mosquito fact sheets) may be found here.  (NC Department of Health and Human Services, Division of Public Health)

What can I do to prevent La Crosse Encephalitis?

  • Use an approved repellent according to the directions on the label
  • Avoid peak biting hours (approximately 2 hours before and after dusk and dawn)
  • Wear protective clothing
  • Reduce “breeding” sites around your house
  • Repair screen windows and doors

More information about prevention may be found here. (Centers for Disease Control and Prevention)

Where can I find more information about La Crosse Encephalitis?
The Centers for Disease Control and Prevention maintains the following webpage dedicated to La Crosse Encephalitis:

Can mosquitoes transmit HIV (the virus that causes AIDS)?
No. Click here for more information.


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