study millions of vaccinated people?

Yes. Several large international studies, including one involving more than 99 million individuals, have helped improve understanding of rare vaccine-related adverse events.

Are serious side effects common?

No. Serious adverse events are rare. Most people experienced only temporary side effects such as soreness, fatigue, or mild fever.

Why do scientists continue studying vaccine safety?

Long-term monitoring helps identify very rare adverse events, improve  vaccine recommendations, and ensure that public  health guidance reflects the latest evidence.

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Final Thoughts

Nearly five years after the first COVID-19 vaccinations, researchers have a much stronger understanding of both the benefits and the risks associated with these vaccines.