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Index/Topics/Vaccine side effects

Vaccine side effects

Vaccines can stimulate immune responses that can occasionally unmask or modulate pre-existing infections or inflammatory states.

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3 results
Jan 15, 2026
Most Viewed

How do booster doses of Pfizer and Moderna affect the frequency and severity of side effects compared with the primary series?

Booster doses of the mRNA COVID-19 vaccines tend to cause local and systemic reactions that are generally similar in type but not more severe than reactions seen after the primary series, with most tr...

Jan 25, 2026
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are vaccines harmful

are not categorically harmful: the bulk of high-quality scientific evidence finds that approved vaccines have a strong safety record and that their public-health benefits generally far outweigh the sm...

Feb 7, 2026

Does the covid vaccine cause leporusy

No credible evidence shows (Hansen’s disease); public-health agencies and fact-checkers report that the rise in some leprosy case counts predates vaccine rollouts and that vaccines cannot transmit Myc...

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