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Last updateTue, 28 Oct 2014 9pm

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Side Effects & Adverse Reactions

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Typical Side Effects of Vaccinations

  • Redness or swelling at site.
  • Pain at injection site.
  • Fever in the first 24 hours.
  • Fussy/irritable.
  • Live attenuated vaccines can have a delayed reaction for up to 4 weeks after vaccination. May present with fever and rash.

 Adverse Reactions are Very Rare and Include

  • Severe allergic reaction. Examples include (but are not limited to): difficulty breathing, swelling of mouth/throat, hives, severe drop in blood pressure (hypotension), and shock.
  • Encephalitis (inflammation of the brain)
  • Febrile seizures (seizures associated with a fever)
  • Thrombocytopenia (Low platelets)
  • Death
  • Please note: any adverse reaction should be reported to the Vaccine Adverse Event Reporting System (VAERS) either on the internet at or by calling 1-800-822-7967.

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