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 Vaccine Safety Basics
bullet Information for Parents
bullet Why It's Important to Monitor Vaccine Safety
bullet How Vaccines Are Tested and Monitored
bullet Common Questions
bullet Vaccine Safety Concerns
bullet History of Vaccine Safety

 Public Health Activities
bullet Vaccine Adverse Event Reporting System (VAERS)
bullet Vaccine Safety Datalink (VSD) Project
bullet Clinical Immunization Safety Assessment (CISA) Network
bullet Brighton Collaboration
bullet Vaccine Technology
bullet Emergency Preparedness
bullet Publications
bullet Scientific Agenda

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.

Featured Items

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 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).
MMWR Logo Fainting (Syncope) After Vaccination
Learn who is most likely to faint, and how health care providers can help prevent it.
Photo of Teen Girls Gardasil® Vaccine Reports to VAERS
Less than 7% of reports concerning Gardasil, a vaccine developed to prevent cervical cancer, mention serious side effects.
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.
Page last reviewed: June 2, 2008
Page last updated: June 2, 2008
Source: Immunization Safety Office, Office of the Chief Science Officer
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

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