Coronavirus vaccinations for pregnant women are underway in the United States, and public health officials say they have received no reports of adverse effects.
The Centers for Disease Control and Prevention says more than 51,000 expecting mothers got the shots as of March 15.
The CDC says "pregnant people are at an increased risk for severe illness from COVID-19 when compared to non-pregnant people."
It also says although there are only limited data on the safety and efficacy of the vaccines in pregnant women, experts believe that the vaccines "are unlikely to pose a specific risk for people who are pregnant."
A study on about 1,800 pregnant women suggests that the risk of pregnancy complications is the same between those who were vaccinated and those who were not.
Vaccine developers have started clinical trials on the safety of the vaccines for pregnant women. Research laboratories are also studying the vaccines' safety.
The trials are expected to produce data that will help healthcare professionals decide when expecting mothers should be vaccinated and what amount of antibodies are transferred to babies in the womb.
The World Health Organization has held off on recommending the shot to all pregnant women. But it makes an exception for high-risk cases --- including medical workers.
The UK is allowing pregnant women to get the vaccine only after consulting a doctor.
Israel, which a world leader in vaccinations, is recommending it.