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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. Influenza, Seasonal (Flulaval Quadrivalent)
  4. Cardiac monitoring
Influenza, Seasonal (Flulaval Quadrivalent)×Cardiac monitoring

Cardiac monitoring Reports for Influenza, Seasonal (Flulaval Quadrivalent)

#480 most reported symptom for this vaccine

40
Reports
0
Deaths
15
Hospitalizations
0
Mortality Rate
%
37.5
Hosp. Rate
%

Cardiac monitoring and Influenza, Seasonal (Flulaval Quadrivalent)

Cardiac monitoring has been reported 40 times in association with Influenza, Seasonal (Flulaval Quadrivalent) vaccination in VAERS. This represents 0.1% of all 52,111 reports for this vaccine.

Among these reports, 0 mentioned death (0.00%) and 15 involved hospitalization (37.5%).

Cardiac monitoring is the #480 most frequently reported symptom for Influenza, Seasonal (Flulaval Quadrivalent) out of 2354 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 40 reports of Cardiac monitoring after Influenza, Seasonal (Flulaval Quadrivalent) 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 Cardiac monitoring occurred after vaccination, not that the vaccine caused it.
•Background rates: Cardiac monitoring 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

Interchange of vaccine products41 reportsInjection site discharge40 reportsMydriasis40 reportsGastrointestinal disorder40 reports

Quick Facts

Reports:40
Deaths:0
Hospitalizations:15
% of Vaccine:0.1%
Rank:#480 of 2354

Related Pages

Influenza, Seasonal (Flulaval Quadrivalent) OverviewCardiac monitoring (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.