Welcome to MEDALERTS
A Service of the National Vaccine Information Center

Providing Online Access to
The U.S. Government's VAERS Database

Access VAERS Basic Search Search for symptoms, dates, places, and more. Hot-Lot Search Takes a basic search and sorts the results according to which drug lots are mentioned the most. Whole-Database Operations Both online and offline operations are available, including a download of the data for local analysis.

What is VAERS? Since 1990, the U.S. Government has collected many thousands of reports of vaccine damage. This database, called the Vaccine Adverse Event Reporting System (VAERS) is available for anyone to download. However, the data available from the government is difficult to use for these reasons: It is broken up into separate databases for each year. Each year's data is split into two different files: one with the details of the case, and another with specific information about the vaccinations that were given. There are some formatting errors in these files. This site combines all of the VAERS databases into a single online search engine.

Reporting Vaccine Damage If you suspect that you or your child has experienced a vaccine reaction, report that reaction to the government at the Vaccine Adverse Events Reporting System. Due to reporting of adverse events, the rotavirus vaccine was removed from the market for causing bowel obstructions in infants and children. You can also report a reaction to the National Vaccine Information Center. We have kept a vaccine adverse event database since 1982. To report a reaction to NVIC, click here.

Information Yearly Summary List of Abbreviations Background Information Links