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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.

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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.

  1. Home
  2. Vaccines
  3. FLU(H1N1)
  4. C-reactive protein increased
FLU(H1N1)×C-reactive protein increased

C-reactive protein increased Reports for FLU(H1N1)

#243 most reported symptom for this vaccine

24
Reports
0
Deaths
9
Hospitalizations
0
Mortality Rate
%
37.5
Hosp. Rate
%

C-reactive protein increased and FLU(H1N1)

C-reactive protein increased has been reported 24 times in association with FLU(H1N1) vaccination in VAERS.

Among these reports, 0 mentioned death (0.00%) and 9 involved hospitalization (37.5%).

C-reactive protein increased is the #243 most frequently reported symptom for FLU(H1N1) out of 993 total symptoms.

Disclaimer: VAERS reports describe events that occurred after vaccination but do not establish that the vaccine caused the event. Many reported symptoms may be coincidental or related to underlying conditions.

What This Means

Seeing 24 reports of C-reactive protein increased after FLU(H1N1) vaccination may seem alarming, but context is critical.

The mortality rate among these reports is very low at 0.00%, suggesting most cases are non-fatal.

Important Context

•Association, not causation: These reports show C-reactive protein increased occurred after vaccination, not that the vaccine caused it.
•Background rates: C-reactive protein increased may occur naturally at baseline rates in the population, unrelated to vaccination.
•Anyone can report: VAERS accepts reports from anyone — patients, parents, healthcare providers — without requiring medical verification.
•Denominator missing: VAERS counts reports, not rates per dose. Without knowing how many doses were given, raw counts can be misleading. Learn more →

Similarly Ranked Symptoms

Rash maculo-papular24 reportsDiplopia24 reportsJoint range of motion decreased24 reportsLumbar puncture abnormal24 reports

Quick Facts

Reports:24
Deaths:0
Hospitalizations:9
% of Vaccine:—%
Rank:#243 of 993

Related Pages

FLU(H1N1) OverviewC-reactive protein increased (All Vaccines)Why Raw Numbers MisleadTop Symptoms Analysis

Data Source

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