Pfizer Confirms It Ended COVID-19 Vaccine Pregnancy Trial Early

A nurse prepares a Pfizer-BioNTech COVID-19 vaccine in Hartford, Conn., on Jan. 6, 2022. Joseph Prezioso/AFP via Getty Images

Pfizer has confirmed it stopped its clinical trial analyzing COVID-19 vaccine safety and efficacy in pregnant women early.

The company said that enrollment in the study stopped in the fourth quarter of 2021 after health experts, including the U.S. Advisory Committee on Immunization Practices, began recommending the Pfizer-BioNTech vaccine for pregnant women.