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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.
Chills
156,139 total reports4.7% serious outcomes
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156,139
Total Reports
650
Deaths
6,684
Hospitalizations
4.7
Severity Rate
% serious outcomes
About Chills Reports
Chills has been reported 156,139 times in VAERS from 1990 to 2026.
Of these reports, 650 were associated with death (0.42%) and 6,684 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning Chills is 4.7%.
Understanding Chills in VAERS
•Temporal association only: These reports show Chills 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 Chills. 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. COVID19123,366
2. VARZOS15,726
3. FLU37,960
4. PPV5,984
5. FLU42,964
6. TDAP2,903
7. FLUX2,835
8. UNK2,154
9. COVID19-22,083
10. HEP1,720
Detailed Breakdowns
Quick Facts
Reports:156,139
Deaths:650
Hospitalizations:6,684
Mortality Rate:0.42%
Severity Rate:4.7%
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.