Vaccine Adverse Event Reporting System
VAERS is a national post-marketing vaccine safety surveillance program cosponsored. VAERS collects information about adverse events (possible side effects) that occur after the administration of vaccines licensed in the U.S. It provides a nationwide mechanism by which adverse events following immunization may be reported, analyzed, and made available to the public. It also provides a vehicle for disseminating vaccine safety related information to parents and guardians, healthcare providers, vaccine manufacturers, state vaccination programs, and other constituencies.