What are the side effects of the influenza A H1N1 monovalent vaccine?

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Side effects of influenza A H1N1 monovalent vaccine may include:

  • discomfort or inflammation at the injection site
  • headaches
  • chills
  • cough
  • runny nose
  • stuffy nose
  • sore throat
  • upset stomach
  • muscle aches
  • fatigue

Tell your doctor if these side effects persist or become severe. More serious side effects, including those of allergic reaction, are the following:

  • severe itching
  • a rash or hives
  • swelling of the face or mouth
  • troubled breathing
  • muscle weakness
  • facial paralysis

If these symptoms occur, seek medical attention immediately.

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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.