Here, we answer questions about COVID-19 that pertain to pregnant patients and the COVID-19 booster shot. After reviewing this page, we encourage you to visit the Mass General Brigham COVID-19 website for more complete information about ways you can protect yourself and your loved ones from the novel coronavirus.

Mass General Brigham COVID-19 Info

Q: Why are Pfizer COVID-19 Vaccine boosters being recommended for certain high-risk individuals?

A: The FDA reviewed data from the Pfizer company that demonstrated that levels of immunity decrease slightly over time and after > six months following the initial Pfizer vacine series, studies have shown a small increase in breakthrough COVID-19 cases compared to individuals who were vaccinated more recently. While so far these breakthrough cases in reproductive age individuals have not been associated with more severe illness, hospitalizations or deaths, the FDA and the CDC believe that certain high-risk populations could benefit from additional protection.

Q: Is pregnancy an indication to get the Pfizer Booster?

A: Yes. All pregnant people, ages 18 and older, who received the Pfizer-BioNTech vaccine greater than six months ago are recommended to get the vaccine booster. 

Q: If I am pregnant and wish to receive a booster but I got Moderna or J+J as my original vaccine, can I get the Pfizer booster?

A: At this time, the FDA and CDC are only recommending that individuals who had the Pfizer doses originally receive the Pfizer boosters. The FDA is actively reviewing data from the makers of Moderna and J+J and will hopefully have a recommendation soon for boosters for those that received Moderna or J+J originally. There is currently no recommendation to mix and match vaccine types.

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Additional References and Resources


This content was prepared by Ilona Goldfarb, MD, for the Department of Obstetrics and Gynecology.
Date originally published: 10/7/2021