Can the Japanese encephalitis vaccine cause a reaction?

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The Japanese encephalitis vaccine (IXIARO) could cause a reaction in some people. Symptoms may include headache, pain, redness or swelling at the injection site and muscle pain. Skin reactions, rash, nausea, flu-like symptoms, fatigue and fever are also possible. These symptoms may develop within 30 days after vaccination.

If you have symptoms of a reaction after getting the Japanese encephalitis vaccine, tell your doctor immediately because you may need medical attention.

As with any vaccine, there also is a risk of allergic reaction, which may occur within 30 days after you get the shot. If you develop any of these symptoms, call your doctor or get emergency medical help immediately:
  • trouble breathing
  • hoarseness or wheezing
  • hives
  • paleness
  • weakness
  • fast heartbeat
  • dizziness

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.