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Pfizer to Begin COVID Vaccine Clinical Trial in Expectant Mothers

Photo: Patrick T. Fallon/AFP via Getty Images

Pfizer-BioNTech said Thursday that it is beginning clinical trials of its Covid-19 vaccine in pregnant women, the first such trials to include expectant mothers in the U.S.

The drugmaker aims to enroll about 4,000 pregnant women in the trials, which will include participants in the U.S. as well as Argentina, Brazil, Canada, Chile, Mozambique, South Africa, Spain, and the U.K. Women over 18 and who are 24 to 34 weeks into their pregnancy will be eligible.

The first doses will be administered in the U.S ...