⚠️
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.
Mass
3,031 total reports5.4% serious outcomes
Share
3,031
Total Reports
16
Deaths
147
Hospitalizations
5.4
Severity Rate
% serious outcomes
About Mass Reports
Mass has been reported 3,031 times in VAERS from 1990 to 2026.
Of these reports, 16 were associated with death (0.53%) and 147 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning Mass is 5.4%.
Understanding Mass in VAERS
•Temporal association only: These reports show Mass occurred after vaccination, not necessarily because of vaccination.
•Background rates matter: Many symptoms occur naturally at baseline rates in the population, unrelated to vaccination.
•Reporting variability: Medical terminology may be used differently by various healthcare providers and over time.
•Investigation needed: High-frequency reports may trigger further epidemiological studies to determine causation.
What This Data Shows
Most Associated Vaccines: The vaccines most frequently mentioned in reports with Mass. This may reflect usage patterns, not causation.
Severity Patterns: The percentage of reports that involve serious outcomes can help prioritize safety investigations.
Reporting Trends: Changes in reporting frequency over time may reflect increased awareness, media attention, or actual safety signals.
Most Associated Vaccines
1. COVID191,705
2. VARZOS389
3. FLU3245
4. TDAP217
5. PPV182
6. VARCEL139
7. FLU4105
8. PNC1392
9. HPV491
10. MMR89
Detailed Breakdowns
Quick Facts
Reports:3,031
Deaths:16
Hospitalizations:147
Mortality Rate:0.53%
Severity Rate:5.4%
Related Analysis
Explore Further
Data Source
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.