Pfizer, BioNTech begin COVID-19 vaccine trials on pregnant women

Click to play video: 'Health Matters: Should pregnant and breastfeeding women get the COVID-19 vaccine?'
Health Matters: Should pregnant and breastfeeding women get the COVID-19 vaccine?
WATCH ABOVE: Pregnant and breastfeeding women were not initially included in COVID-19 vaccine trials – Feb 17, 2021

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.

Last week, the U.S. National Institutes of Health called for greater inclusion of pregnant and lactating women in COVID-19 vaccine research.

Bioethicists, vaccine and maternal health experts have argued for years that pregnant women should be included early in trials of pandemic vaccines so they would not need to wait until long after a successful one emerges.

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Click to play video: 'Pregnant and breastfeeding women eligible for COVID-19 vaccine'
Pregnant and breastfeeding women eligible for COVID-19 vaccine

Nevertheless, pregnant women were excluded from the large U.S. trials used to obtain emergency use authorization of COVID-19 vaccines.

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Drugmakers have said they first need to make sure the vaccines are safe and effective more generally. In the United States, regulators require drugmakers to conduct safety studies in pregnant animals before vaccines are tested in pregnant women to ensure they do not harm the fetus or lead to a miscarriage. The companies said those studies revealed no new risks.

Click to play video: 'New COVID-19 guidelines released for pregnant women, future moms'
New COVID-19 guidelines released for pregnant women, future moms

Pregnant women in the United States have already received their first doses, the companies said.

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The new study will test pregnant women aged 18 and older in the United States, Canada, Argentina, Brazil, Chile, Mozambique, South Africa, the UK and Spain.

Women will receive the vaccine during weeks 24-34 of gestation, getting two shots 21 days apart – the same regimen used in the larger clinical trial.

Shortly after giving birth, participants who got a placebo in the trial will be given an opportunity to get the actual vaccine, while remaining part of the study, the companies said.

(Reporting by Julie Steenhuysen Editing by Bill Berkrot)

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