Important: VAERS reports alone cannot determine if a vaccine caused an adverse event. Reports may contain incomplete, inaccurate, or unverified information. Correlation does not equal causation.
Vaccine Not Specified
About Vaccine Not Specified
Vaccine Not Specified has 29,669 reports in VAERS spanning from 1990 to 2026.
Of these reports, 433 mentioned death, 2,102 involved hospitalization, and 3,748 required emergency department visits.
This vaccine is manufactured by: Unknown Manufacturer, Merck & Co., Connaught Laboratories, Mass. Public Health Bio Lab.
This vaccine accounts for 1.5% of all 1,983,260 reports in the VAERS database.
Reporting Rate
This vaccine averages 802 reports per year over 37 years of reporting (1990–2026).
Understanding These Numbers
Most Reported Symptoms
Top Reporting States
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Data Source
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.