COVID-19 vaccines: key facts

The European Medicines Agency (EMA) helps ensure that COVID-19 vaccines offer continued protection against the SARS-CoV-2 coronavirus, including variants such as Delta and Omicron, by working with European Union (EU) and international partners. The information below explains how EMA evaluates data and makes recommendations on the protection provided by vaccines, their safety, vaccination in children, boosters and related topics.

Virus variants

Immunity (protection)

Boosters and mixing vaccines

Vaccination during pregnancy

Vaccination in children

Differences across the EU

Vaccine safety

Vaccine authorisation

Finding out more


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