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 Vaccine Safety Basics
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  For immunization safety information, call the CDC-INFO Contact Center at:

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Vaccine Safety

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Photograph of a Girl Being Vaccinated Monitoring health problems after vaccination is essential to ensure the United States continues to have the safest, most effective vaccine supply in history.

CDC's Immunization Safety Office identifies possible vaccine side effects and conducts studies to determine whether a health problem is caused by a specific vaccine.

In the News

FDA Logo FDA Revises Gardasil Label:
Healthcare providers are reminded to closely observe patients for 15 minutes following vaccination due to reports of fainting and falling.


H1N1 Flu 2009H1N1 Flu Update: The outbreak of disease in people caused by a new influenza virus of swine origin continues to grow in the United States and internationally.  CDC is issuing and updating interim guidance daily in response to the rapidly evolving situation.  More...

Featured Items

Arnold Steigerwalt, a research chemist with CDC's Meningitis and Special Pathogens Branch in the National Center for Infectious Diseases, performs a DNA-DNA hybridization analysis. How Vaccines are Tested and Monitored  Vaccines must be licensed by the U.S. Food and Drug Administration (FDA) before they can be used in the United States.
Photo of Teen Girls Human Papillomavirus (HPV) Vaccine Safety
The HPV vaccine, Gardasil, protects against the types of HPV that most commonly cause cervical cancer and genital warts.
Photo of a boy and a girl CDC Statement on Autism and Thimerosal
Evidence from several studies does not support an association between thimerosal in vaccines and autism.
Photo of CDC researchers as they review incoming data on a computer Rapid Cycle Analysis (RCA)
This active surveillance system is designed to detect adverse events (possible side effects) following vaccination very quickly.
Photo of Baby Being Vaccinated RotaTeq Vaccine Safety Study
This study looked for evidence of a link between RotaTeq and intussusception (a type of bowel obstruction).
Asian infant Haemophilus Influenzae Type b (Hib) Vaccine
Hib disease, preventable by vaccination, is a serious disease caused by a bacteria that usually strikes children under 5.
Page last modified: June 25, 2009
Source: Immunization Safety Office
Health Topics
• Immunization Schedules
• Preventing Flu with Vaccination
• Traveler's Health: Vaccinations
• Vaccine-Preventable Diseases
• Hepatitis B
• Human Papillomavirus (HPV)
• Immunization FastStats
• Vaccines and Autism FAQs
• CDC en Español: Inmunización

Government Agencies
• National Center for Immunization and Respiratory Diseases
• National Vaccine Injury Compensation Program
• National Vaccine Program Office
• U.S. Food and Drug Administration
• National Institute of Allergy and Infectious Diseases (NIAID)

Helpful Links
• Site Map
• Vaccine Glossary
• About the ISO
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