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Index/Organizations/J&J/Janssen

J&J/Janssen

Fact-Checks

3 results
Dec 21, 2025
Most Viewed

Do reported deaths after COVID-19 vaccination mean the vaccine caused the death?

Reported deaths that occur after COVID-19 vaccination are not, by default, proof that the vaccine caused the death; post‑vaccination death reports are signals that require investigation, and multiple ...

Nov 10, 2025
Most Viewed

What is the overall chance of a serious adverse effect from routine vaccines in adults?

Routine adult vaccines carry a of serious adverse effects, generally on the order of single-digit to low‑double-digit excess cases per million doses for particular rare outcomes; public health agencie...

Nov 19, 2025

When should someone seek medical care for post-vaccine symptoms after a Moderna or Pfizer COVID-19 shot?

Mild-to-moderate post‑vaccine reactions — sore arm, fever, fatigue, headache, muscle and joint pain — are common and usually transient after Pfizer or Moderna mRNA COVID‑19 shots; clinical trials repo...

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