FILE PHOTO: Vials of the Pfizer-BioNTech vaccine are pictured in a vaccination center as part of the coronavirus disease (COVID-19) vaccination campaign in Geneva, Switzerland February 3, 2021. REUTERS/Denis Balibouse
CHICAGO (Reuters) - Pfizer Inc and BioNTech SE have started an international study with 4,000 volunteers to evaluate the safety and effectiveness of their COVID-19 vaccine in healthy pregnant women, the companies said on Thursday.
Pregnant women are at higher risk of developing severe COVID-19, and many public health officials have recommended some women in high-risk professions take coronavirus vaccines even without proof they are safe for them.
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