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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.

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  3. Influenza, Seasonal (Fluad Quadrivalent)
  4. C-reactive protein increased
Influenza, Seasonal (Fluad Quadrivalent)×C-reactive protein increased

C-reactive protein increased Reports for Influenza, Seasonal (Fluad Quadrivalent)

#209 most reported symptom for this vaccine

12
Reports
1
Deaths
9
Hospitalizations
8.33
Mortality Rate
%
75
Hosp. Rate
%

C-reactive protein increased and Influenza, Seasonal (Fluad Quadrivalent)

C-reactive protein increased has been reported 12 times in association with Influenza, Seasonal (Fluad Quadrivalent) vaccination in VAERS. This represents 0.3% of all 4,184 reports for this vaccine.

Among these reports, 1 mentioned death (8.33%) and 9 involved hospitalization (75.0%).

C-reactive protein increased is the #209 most frequently reported symptom for Influenza, Seasonal (Fluad Quadrivalent) out of 673 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 12 reports of C-reactive protein increased after Influenza, Seasonal (Fluad Quadrivalent) vaccination may seem alarming, but context is critical.

The 8.33% mortality rate among these reports is elevated, but this reflects the severity of the condition itself rather than vaccine causation.

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

Haemorrhage12 reportsImpaired driving ability12 reportsInfluenza virus test negative12 reportsImmunisation reaction12 reports

Quick Facts

Reports:12
Deaths:1
Hospitalizations:9
% of Vaccine:0.3%
Rank:#209 of 673

Related Pages

Influenza, Seasonal (Fluad Quadrivalent) 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.