VAERS is the Vaccine Adverse Event Reporting System put in place in 1990. It is a voluntary reporting system that has been estimated to account for only 1%* of vaccine injuries. OpenVAERS is built from the HHS data available for download at  The OpenVAERS Project allows browsing and searching of the reports without the need to compose an advanced search (this can be done at”

The OpenVAERS Project. The OpenVAERS Project.

​*Lazarus, R., Klompas, M., & Bernstein, S. Electronic Support for Public Health – Vaccine Adverse Event Reporting System (ESP:VAERS) (Massachusetts) | AHRQ Digital Healthcare Research: Informing Improvement in Care Quality, Safety, and Efficiency. 30 September 2010.“Likewise, fewer than 1% of vaccine adverse events are reported. Low reporting rates preclude or slow the identification of “problem” drugs and vaccines that endanger public health.”