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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.

About Vaccine Safety

Vaccines Safety Basics

Vaccines: Hib, HPV, MMR, MMRV, Rotavirus...

How Vaccines are Monitored

How Vaccines are Tested, Vaccine Monitoring Activities in the U.S. and Common Questions, etc...

Special Populations

Information for Healthcare Providers, Parents, Researchers...

Addressing Common Concerns

Autism, GBS, SIDS, Fainting (Syncope), MS, Thimerosal, FAQs...


About CISA Project, Emergency Preparedness, VAERS, VAU, VSD...

Resource Library

Articles, Fact Sheets, FAQs, Research...

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    TTY: (888) 232-6348
  • Contact CDC–INFO The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Road Atlanta, GA 30329-4027, USA
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