Adverse events rare with both Moderna, Pfizer vaccines

June 16, 2022 – Both the Moderna and Pfizer vaccines for COVID-19 are very safe and strongly recommended, according to a new study.

Researchers from the VA Boston Healthcare System, the CAUSALab at Harvard T.H. Chan School of Public Health, Brigham and Women’s Hospital, and Harvard Medical School found a very low risk of adverse events for both vaccines in a group of 433,672 veterans over a 38-week period.

“For individuals planning to be vaccinated, I would highly recommend either vaccine, depending on which is first available,” said Arin Madenci, a visiting scientist at Harvard Chan School, in a June 13, 2022 VA press release. “Adverse events were rare after both vaccines, particularly when compared with the health risks driven by infection with SARS-CoV-2, the virus that causes COVID-19, which both vaccines are highly effective at preventing.”

Read the VA Boston Healthcare System press release: Few differences in safety profiles of Moderna, Pfizer COVID-19 vaccines