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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.
Pyrexia
276,779 total reports9.5% serious outcomes
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276,779
Total Reports
2,361
Deaths
23,891
Hospitalizations
9.5
Severity Rate
% serious outcomes
About Pyrexia Reports
Pyrexia has been reported 276,779 times in VAERS from 1990 to 2026.
Of these reports, 2,361 were associated with death (0.85%) and 23,891 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning Pyrexia is 9.5%.
Understanding Pyrexia in VAERS
•Temporal association only: These reports show Pyrexia 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 Pyrexia. 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. COVID19154,091
2. MMR23,873
3. HIBV21,208
4. VARZOS19,959
5. FLU316,290
6. DTAP16,011
7. PPV15,935
8. VARCEL14,829
9. HEP13,133
10. OPV13,072
Detailed Breakdowns
Quick Facts
Reports:276,779
Deaths:2,361
Hospitalizations:23,891
Mortality Rate:0.85%
Severity Rate:9.5%
Related Analysis
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Data Source
This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.