Health Advice



Mayo Clinic Q And A: Should pregnant women be vaccinated for COVID-19?

From Mayo Clinic News Network, Mayo Clinic News Network on

Published in Health & Fitness

DEAR MAYO CLINIC: I am a teacher at a middle school that is teaching students in person. I have been vigilant about following safety guidelines, but now that I am pregnant, I worry even more about contracting COVID-19 and the risk to my baby. Our state is opening up COVID-19 vaccines to educators, and I am wondering whether it is safe for me to be vaccinated for COVID-19?

ANSWER: Pregnant women are at an increased risk for serious illness if they become infected with COVID-19. Pregnant women have altered immune systems, and that could make them more susceptible to COVID-19. Also, research shows that pregnant women with underlying comorbidities or medical health conditions are at higher risk of having worse outcomes if they are infected. Compared to women who are not pregnant, have the same health conditions and are at the same age, a pregnant woman is about 1.3 to 1.4 times more likely to be hospitalized if infected with COVID-19.

While there are limited data about current COVID-19 vaccines in pregnant women and breastfeeding mothers, it is important to understand the risks and benefits for you and your baby. Early research indicates that antibodies induced by the vaccine, which are passed to the baby through the placenta and in breast milk, may be beneficial to the baby. Studies are ongoing and women should talk with their health care providers about any concerns.

But since the Food and Drug Administration granted emergency use authorization for COVID-19 vaccines, The American College of Obstetricians and Gynecologists and the Society for Maternal-Fetal Medicine have firmly recommended that pregnant women have access to them if they so choose.

I have received many questions about whether a fetus can be exposed to COVID-19 by a mother being vaccinated for COVID-19. The answer is no. Any vaccine that has a live virus that replicates is not used in pregnant women because of any theoretical risk. The COVID-19 vaccines are not using live virus. Therefore, the baby should not be exposed to the virus, as the COVID-19 vaccines are the genetic code for a single protein. It doesn't replicate in a person. It doesn't cause an infection of COVID-19.

Because the COVID-19 vaccines are for emergency use, they were not tested in pregnant women during the first trials. So, there is no direct evidence of safety in pregnancy. What is known is that there is a lack of theoretical evidence of harm.


There is no reason why COVID-19 vaccines should harm pregnant women. None of the components of the vaccines — the nanoparticles — are known to be harmful in pregnancy. The best evidence for pregnant women suggests that being vaccinated for COVID-19 is a lot safer than getting COVID-19. Likewise, there is no indication that COVID-19 vaccines are harmful or damaging to women who are breastfeeding or to their infants.

Recently, a safety study compared women who were pregnant and not pregnant, and who received COVID-19 vaccines. The report showed no significant differences in reactions between the two groups.

The data review, which was performed by the Advisory Committee for Immunization Practices, indicates that over 30,000 women who are pregnant have safely been vaccinated for COVID-19. The preliminary safety study, which took place between December 2020 and January 2021, compared women who were pregnant and not pregnant, and who received the Pfizer or Moderna COVID-19 vaccines.

The advisory committee found that one day after vaccination, local reactions in both study groups were similar. In nearly all cases, no significant differences in reactions were experienced, such as localized pain, redness, fatigue, headache or fever.


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