What are the risks of getting the Japanese encephalitis vaccine?

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Risks of the Japanese encephalitis vaccine (IXIARO) include side effects and allergic reactions, although reactions are unlikely. The side effects that can occur, usually soon after getting the shot, include headache and muscle pain, as well as pain, redness or swelling at the injection site. The vaccine can also cause a high fever, nausea, skin reactions such as a rash, fatigue, flu-like symptoms or changes in behavior.

Signs of a serious allergic reaction, for which you should get immediate emergency medical help, include:
  • 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.