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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. Muscle strain
Influenza, Seasonal (Flulaval Quadrivalent)×Muscle strain

Muscle strain Reports for Influenza, Seasonal (Flulaval Quadrivalent)

#643 most reported symptom for this vaccine

27
Reports
0
Deaths
2
Hospitalizations
0
Mortality Rate
%
7.4
Hosp. Rate
%

Muscle strain and Influenza, Seasonal (Flulaval Quadrivalent)

Muscle strain has been reported 27 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 2 involved hospitalization (7.4%).

Muscle strain is the #643 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 27 reports of Muscle strain 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 Muscle strain occurred after vaccination, not that the vaccine caused it.
•Background rates: Muscle strain 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

Tonic clonic movements27 reportsMoaning27 reportsOral discomfort27 reportsPulse absent27 reports

Quick Facts

Reports:27
Deaths:0
Hospitalizations:2
% of Vaccine:0.1%
Rank:#643 of 2354

Related Pages

Influenza, Seasonal (Flulaval Quadrivalent) OverviewMuscle strain (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.