- Reactions to a recent immunization (vaccine)
- Most are reactions at the shot site (such as pain, swelling, redness)
- General reactions (such as a fever or being fussy) may also occur
Reactions to These Vaccines are Covered:
- Chickenpox (varicella) virus
- COVID-19 virus
- DTaP (Diphtheria, Tetanus, Pertussis)
- Hemophilus influenzae type b
- Hepatitis A virus
- Hepatitis B virus
- Human Papilloma virus
- Influenza virus
- MMR (Measles, Mumps, Rubella)
- Polio virus
- Tuberculosis (BCG vaccine)
Symptoms of Vaccine Reactions
- Local Reactions. Shot sites can have swelling, redness and pain. Most often, these symptoms start within 24 hours of the shot. They most often last 3 to 5 days. With the DTaP vaccine, they can last up to 7 days.
- Fever with most vaccines begins within 24 hours and lasts 1 to 2 days.
- Delayed Reactions. With the MMR and chickenpox shots, fever and rash can occur. These symptoms start later. They usually begin between 1 and 4 weeks.
- Anaphylaxis. Severe allergic reactions are very rare. They start within 20 minutes. Sometimes can occur up to 2 hours after the shot. Vaccine health workers know how to treat these reactions.
Vaccine Free App
- Vaccines on the Go app from Children's Hospital of Philadelphia
- This free app can answer any vaccine questions you may have
- It is fact-based and up-to-date