Mosquito-Borne Viral Encephalitis


Encephalitis is inflammation of the brain. Certain mosquito-borne viruses can lead to encephalitis. Examples of these viruses include:
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The most common cause is being bitten by an infected mosquito. There are other, rarer causes, such having a blood transfusion with infected blood.

Risk Factors

The greatest risk factors are spending time in areas where mosquitoes are present and not using insect repellent.People who are age 50 years and older and those with a weakened immune system have a higher risk of developing serious symptoms.


Most people who become infected with one of these mosquito-borne viruses do not develop any symptoms.If symptoms do occur, they are generally mild and may include flu-like symptoms, such as:
  • Headache
  • Fever
  • Chills
  • Fatigue
  • Joint and muscle pain
  • Vomiting
While rare, a small percentage of people develop encephalitis and have serious, life-threatening symptoms, such as:

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