COVID-19 changed daily life around the world and led to one of the largest vaccination campaigns in modern history. As hundreds of millions of people received vaccines, researchers gained an opportunity to study their safety across much larger populations than could be included in clinical trials. Years later, scientists continue to analyze health data to better understand both common reactions and rare adverse events reported after vaccination. The subject can easily become alarming or confusing. A more useful approach is to look carefully at what researchers have actually observed, distinguish an event occurring after vaccination from one proven to be caused by vaccination , and keep the size of any risk in perspective. 🌍 From the Beginning of the Pandemic to Vaccination COVID-19 emerged in late 2019 and quickly developed into a worldwide public-health emergency. France confirmed its first COVID-19 cases in January 2020. As infections increased, the country introduced a natio...
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