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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.
Merck & Co.
479,971 total reports18.2% market share
479,971
Total Reports
4,153
Deaths
28,968
Hospitalizations
22
Vaccines
About Merck & Co.
Merck & Co. has 479,971 adverse event reports in VAERS, representing 18.2% of all manufacturer-attributed reports.
Of these reports, 4,153 mentioned death and 28,968 involved hospitalization.
Merck & Co. produces 22 vaccines tracked in VAERS. As one of the largest vaccine manufacturers by report volume, their high report count primarily reflects extensive market distribution rather than safety concerns.
Vaccines by Merck & Co.
| Vaccine | Reports | Deaths | Hospitalizations |
|---|---|---|---|
| VARCEL | 86,601 | 211 | 2,774 |
| MMR | 81,093 | 318 | 4,298 |
| PPV | 59,008 | 180 | 3,113 |
| VARZOS | 43,176 | 174 | 2,543 |
| HPV4 | 40,240 | 285 | 1,993 |
| HEP | 29,959 | 549 | 2,150 |
| HPV9 | 25,561 | 45 | 635 |
| RV5 | 23,031 | 528 | 3,057 |
| MMRV | 22,550 | 31 | 440 |
| HEPA | 17,937 | 45 | 595 |
| HIBV | 14,649 | 381 | 1,408 |
| HBHEPB | 5,864 | 276 | 827 |
| PNC21 | 1,474 | 6 | 47 |
| PNC15 | 1,063 | 7 | 55 |
| RUB | 859 | 0 | 47 |
| MEA | 626 | 9 | 51 |
| MER | 173 | 0 | 18 |
| MU | 142 | 5 | 14 |
| EBZR | 63 | 0 | 5 |
| MM | 57 | 0 | 0 |
| UNK | 34 | 0 | 0 |
| MUR | 30 | 0 | 1 |
Understanding Manufacturer Data
•Market presence matters: More reports often reflect more doses distributed, not necessarily more safety issues.
•Reporting varies: Newer vaccines and those under heightened scrutiny tend to have higher reporting rates.
•All manufacturers meet FDA standards: Safety and efficacy requirements apply equally to all approved vaccines.
Top Vaccines
Data Source
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.