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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.
Leukocytosis
2,540 total reports77.9% serious outcomes
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2,540
Total Reports
204
Deaths
1,775
Hospitalizations
77.9
Severity Rate
% serious outcomes
About Leukocytosis Reports
Leukocytosis has been reported 2,540 times in VAERS from 1990 to 2026.
Of these reports, 204 were associated with death (8.03%) and 1,775 involved hospitalization.
The overall serious outcome rate (death or hospitalization) for reports mentioning Leukocytosis is 77.9%.
Understanding Leukocytosis in VAERS
•Temporal association only: These reports show Leukocytosis 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 Leukocytosis. 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. COVID191,374
2. HIBV505
3. HEP415
4. OPV382
5. PPV375
6. DTP273
7. MMR269
8. FLU3253
9. DTAP213
10. DTPHIB177
Detailed Breakdowns
Quick Facts
Reports:2,540
Deaths:204
Hospitalizations:1,775
Mortality Rate:8.03%
Severity Rate:77.9%
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.