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

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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.

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  3. California

California

CA175,834 total reportsRank #2 of 65 jurisdictions
Share
175,834
Total Reports
1,387
Deaths
8,270
Hospitalizations
30,708
ER Visits

About California VAERS Data

California (CA) has 175,834 adverse event reports in VAERS, representing 8.9% of all reports nationwide.

Of these, 1,387 mentioned death, 8,270 involved hospitalization, and 30,708 required emergency department visits.

With an estimated population of 39,029,000, California has approximately 450.5 reports per 100,000 residents.

Top Vaccines Reported in California

VaccineReportsDeathsHospitalizations
COVID19101,1429644,799
VARZOS9,45621231
FLU38,63155552
MMR8,31128380
DTAP7,82687460
VARCEL7,45013259
HEP5,69594409
TDAP5,29912181
IPV5,19469339
PPV4,91810263
HIBV4,863158620
HEPA4,83412198
FLU44,03319173
COVID19-23,39913125
PNC133,11135278
HPV43,09319124
MNQ2,7704105
PNC2,65390381
UNK2,41136150
HPV92,342855

Understanding State-Level Data

•Population drives volume: More populous states naturally have more reports.
•State of reporter: Reports are attributed to where the reporter lives, which may differ from where vaccination occurred.
•Reporting culture varies: States with more awareness of VAERS or mandated reporting may have higher per-capita rates.

Quick Facts

Reports:175,834
Deaths:1,387
Hospitalizations:8,270
ER Visits:30,708
Share of Total:8.9%
Rank:#2 of 65 jurisdictions
Population:39,029,000
Reports per 100K:450.5

Explore Further

Top Vaccine: COVID19All StatesGeographic AnalysisCompare Vaccines

Related Analysis

Geographic Patterns Analysis →35 Years of Reporting Trends →COVID-19 Impact on VAERS →Serious Outcomes Analysis →Death Reports Deep Dive →

Data Source

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