Republican Sens. Ron Johnson (R-WI) and Rand Paul (R-KY) on Monday released previously undisclosed text messages from Dr. Anthony Fauci, the former director of the National Institutes of Allergy and Infectious Diseases, discussing potential risks of COVID-19 vaccines during early pregnancy. The texts, sent in January 2021, referenced concerns that the immune response triggered by the vaccines could theoretically increase miscarriage risk in the first trimester.
The release of the messages reignited public debate over whether federal health officials withheld critical information about vaccine safety. However, the Centers for Disease Control and Prevention (CDC) and multiple peer-reviewed studies have since confirmed that COVID-19 vaccines do not increase miscarriage risk beyond the general population’s baseline rate.
What the Fauci Texts Reveal
The text exchange between Fauci, then-CDC Director Dr. Rochelle Walensky, and former Surgeon General Dr. Vivek Murthy discussed a hypothetical risk associated with the vaccine’s immune response in early pregnancy. Fauci wrote that a second dose of the vaccine “theoretically could be associated with miscarriage in the 1st trimester.” The messages were obtained as part of a congressional investigation into Fauci’s leadership during the pandemic.
Misleading Claims About Miscarriage Risk
Following the release of the texts, some online commentators and lawmakers, including Sen. Ted Cruz (R-TX), amplified a claim that 82% of pregnant women who received the COVID-19 vaccine in their first trimester miscarried. This figure originated from a misinterpretation of a 2021 study published in the New England Journal of Medicine (NEJM).
The study tracked nearly 4,000 pregnant women who received COVID-19 vaccines early in the rollout. Among the 827 women with completed pregnancies, 104 experienced miscarriages, while 712 resulted in live births. The researchers noted at the time that they could not accurately calculate miscarriage risk due to limitations in the data, including the lack of a control group and the fact that many pregnancies were still ongoing when the study was published.
Scientific Consensus on Vaccine Safety
Despite the initial concerns raised in Fauci’s texts, subsequent research has consistently found no evidence that COVID-19 vaccines increase miscarriage risk. The CDC, the American College of Obstetricians and Gynecologists (ACOG), and the Society for Maternal-Fetal Medicine (SMFM) have all stated that vaccination during pregnancy is safe and recommended to protect both mother and child from severe COVID-19 outcomes.
A 2022 study in JAMA analyzed data from over 100,000 pregnant women and found no association between COVID-19 vaccination and miscarriage. Similarly, a 2023 meta-analysis in The Lancet reviewed multiple studies and concluded that vaccination does not increase the risk of adverse pregnancy outcomes.
Political and Public Response
The release of Fauci’s texts has fueled ongoing political discussions about transparency in public health messaging. Sen. Johnson, in a statement accompanying the text release, criticized the Biden administration’s handling of vaccine safety data, stating that “Americans deserve honesty about the risks and benefits of medical interventions.”
Public health experts, however, have pushed back against the interpretation of the Fauci texts and the miscarriage claim. Dr. Kevin Ault, an obstetrician-gynecologist and president-elect of the National Foundation for Infectious Diseases, told CNN that the “well-studied” nature of the issue makes it unlikely that a significant risk was overlooked. He added that five years of additional data have further confirmed vaccine safety.
Key Takeaways for Pregnant Women
- COVID-19 vaccines are not associated with an increased risk of miscarriage, according to the CDC and multiple studies.
- Vaccination during pregnancy is recommended to reduce the risk of severe illness from COVID-19, which can pose greater risks to both mother and baby.
- The 82% miscarriage figure cited in some claims is based on a misinterpretation of a 2021 study and does not reflect the current scientific consensus.