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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 rigidity
Influenza, Seasonal (Flulaval Quadrivalent)×Muscle rigidity

Muscle rigidity Reports for Influenza, Seasonal (Flulaval Quadrivalent)

#386 most reported symptom for this vaccine

53
Reports
1
Deaths
8
Hospitalizations
1.89
Mortality Rate
%
15.1
Hosp. Rate
%

Muscle rigidity and Influenza, Seasonal (Flulaval Quadrivalent)

Muscle rigidity has been reported 53 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, 1 mentioned death (1.89%) and 8 involved hospitalization (15.1%).

Muscle rigidity is the #386 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 53 reports of Muscle rigidity after Influenza, Seasonal (Flulaval Quadrivalent) vaccination may seem alarming, but context is critical.

The mortality rate of 1.89% warrants monitoring, though VAERS deaths represent temporal associations, not confirmed causal links.

Important Context

•Association, not causation: These reports show Muscle rigidity occurred after vaccination, not that the vaccine caused it.
•Background rates: Muscle rigidity 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

Allergy to vaccine54 reportsHyperaesthesia53 reportsBronchitis53 reportsLimb injury53 reports

Quick Facts

Reports:53
Deaths:1
Hospitalizations:8
% of Vaccine:0.1%
Rank:#386 of 2354

Related Pages

Influenza, Seasonal (Flulaval Quadrivalent) OverviewMuscle rigidity (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.