Researchers have scrutinized the COVID-19 vaccines’ safety and continue to do so. A study published Feb. 12 in the journal Vaccine reported on an international group of more than 99 million people who received COVID-19 vaccines, primarily finding links to known rare side effects. The study largely focused on the Pfizer/BioNTech and Moderna vaccines, which have been widely given in the U.S., as well as the AstraZeneca vaccine, which was never authorized in the U.S.