Skip to main content
VaccineWatch
VaccinesSymptomsStatesAnalysisToolsDashboardCompare

VaccineWatch

Transparent access to VAERS data for informed decision-making. We present the data as-is, with appropriate context and disclaimers.

Explore Data

  • Vaccines
  • Symptoms
  • Manufacturers
  • States
  • Dashboard
  • Compare Tool
  • Search

Deep Dives

  • The Denominator Problem
  • Onset Timing
  • Lot Number Analysis
  • COVID Impact
  • Myocarditis
  • Death Reports
  • Interactive Tools
  • All 23 Articles →

Resources

  • About
  • Methodology
  • FAQ
  • Glossary
  • Side Effects Guide
  • Vaccine Schedule
  • Vaccine Safety
  • Safety Timeline
  • Adverse Events
  • Is VAERS Reliable?
  • Report an Event
  • Disclaimer
  • VAERS Official Site ↗

Sister Sites

  • OpenMedicaid
  • OpenFeds
  • OpenSpending
  • OpenMedicare
  • OpenLobby
  • TheDataProject.ai

Data source: VAERS (Vaccine Adverse Event Reporting System)

Data through 2026 · Updated quarterly

Built by TheDataProject.ai · © 2026 VaccineWatch

Important: VAERS accepts reports of adverse events following vaccination. For any given report, there is no certainty that the reported event was caused by the vaccine. Reports may contain information that is incomplete, inaccurate, coincidental, or unverifiable. Most reports to VAERS are voluntary, which means they are subject to biases. This data cannot be used to determine if vaccines cause or contribute to adverse events.

⚠️

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.

  1. Home
  2. Symptoms
  3. Pyrexia

Pyrexia

276,779 total reports9.5% serious outcomes
Share

Pyrexia appears in 276,779 VAERS reports across all vaccines. Of these, 2,361 reports also mentioned death and 23,891 involved hospitalization. The severity rate (deaths + hospitalizations as a percentage of reports) is 9.5%. The top vaccines associated with this symptom are COVID19, MMR, HIBV. Remember: VAERS reports show temporal association, not causation.

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
View all vaccines →

Detailed Breakdowns

Pyrexia × COVID19 →Pyrexia × MMR →Pyrexia × HIBV →

Quick Facts

Reports:276,779
Deaths:2,361
Hospitalizations:23,891
Mortality Rate:0.85%
Severity Rate:9.5%

Related Analysis

Most Common Symptoms Analysis →Serious Outcomes Analysis →When Do Side Effects Start? →Recovery Rates Analysis →

Explore Further

Compare with Other SymptomsRead Symptoms Analysis

Data Source

This data comes from the Vaccine Adverse Event Reporting System (VAERS), jointly managed by CDC and FDA.