Developing COVID-19 Vaccines

Tracking Safety Using Vaccine Monitoring Systems

As vaccines are distributed outside of clinical trials, several monitoring systems continue to track them to ensure their safety. Millions of people have received COVID-19 vaccines, and results from ongoing vaccine safety monitoring efforts are reassuring. Some people have no side effects. Many people have reported mild side effects after COVID-19 vaccination, like pain or swelling at the injection site, a headache, chills, or fever. These reactions are common. A small number of people have had a severe allergic reaction (called “anaphylaxis”) after vaccination, but this is extremely rare. If this occurs, vaccination providers have medicines available to treat the reaction effectively and immediately.

No unexpected patterns of reactions or other safety concerns have been identified during early vaccine safety monitoring. CDC and FDA continue to closely monitor several reporting systems, like the Vaccine Adverse Event Reporting System (VAERS), Vaccine Safety Datalink (VSD), and v-safe, which help look for any safety issues now that the vaccines are being given to patients in real-world settings across the country.

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