National Vaccine
Information Center

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Access VAERS

Before searching the data, please read the
U.S. Government disclaimer

Search Now

The search engine examines vaccines, symptoms, doses, dates, places, and more. It produces tables, graphs, maps, and full case reports. Online documentation and popup help messages guide you through the use of the search engine.

You can also download the data to do custom analysis.

What is VAERS?

Since 1990, the U.S. Government has collected reports of adverse health events that follow the administration of vaccinations. This database, called the Vaccine Adverse Event Reporting System (VAERS) is available for anyone to search or download.

Why this site? offers an alternative to CDC Wonder, the U.S. Government's official search engine. Medalerts is built directly from the U.S. Government data so it contains the same information. However, this site offers a better user interface, more powerful search capabilities, and more extensive reporting, making it the best VAERS search facility on the web.

Reporting Vaccine Reactions

If you suspect that you or your child has experienced a vaccine reaction, report that reaction to the government. VAERS Button

You can also report a reaction to the National Vaccine Information Center. NVIC has kept a vaccine adverse event database since 1982. To report a reaction to NVIC, click here.


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