Pfizer Study of Covid-19 Vaccine in Pregnant Women Delayed by Slow Enrollment

Pfizer Study of Covid-19 Vaccine in Pregnant Women Delayed by Slow Enrollment



A study led by Pfizer Inc. and BioNTech SE evaluating their Covid-19 vaccine in expectant mothers has been complicated by slow enrollment, researchers say, delaying results that could help inform physicians about how the shots affect pregnant women and their babies.

Pfizer closed enrollment at many U.S. sites this summer, after fewer than expected numbers of subjects entered the study, researchers say. The slow enrollment was driven by revised guidelines from government and physician groups that recommend pregnant women receive the shots based on new real-world research, according to trial-site researchers. They also say increased vaccine supply made a trial that included the possibility of being given a placebo instead of a vaccine unappealing to expectant mothers and raised questions about the ethics of seeking volunteers.



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Rachel Meadows

Rachel Meadows

Trending topics news writer who enjoys cooking, walking her dog and travel.

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