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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.
Lethargy
18,435 total reports16.7% serious outcomes
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18,435
Total Reports
505
Deaths
2,579
Hospitalizations
16.7
Severity Rate
% serious outcomes
About Lethargy Reports
Lethargy has been reported 18,435 times in VAERS from 1990 to 2026.
Of these reports, 505 were associated with death (2.74%) and 2,579 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning Lethargy is 16.7%.
Understanding Lethargy in VAERS
•Temporal association only: These reports show Lethargy 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 Lethargy. 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. COVID1910,936
2. DTAP1,693
3. HIBV1,428
4. IPV1,338
5. VARZOS1,337
6. PNC1,247
7. MMR1,114
8. HEP894
9. RV5887
10. FLU3870
Detailed Breakdowns
Quick Facts
Reports:18,435
Deaths:505
Hospitalizations:2,579
Mortality Rate:2.74%
Severity Rate:16.7%
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.