Full Breakdown
Ted Cruz’s Miscarriage Claim Sparks Backlash and Clarifies Vaccine Safety Data
8/15/2026, 2:42:12 AM
Core Event
Sen. Cruz’s claim of “bombshell data” was quickly challenged by medical experts and fact-checkers, who identified a statistical misreading of a 2021 New England Journal of Medicine (NEJM) study. The post was later removed after widespread criticism and a community-note correction.
Background & Context
The NEJM analysis drew on the CDC’s V-Safe pregnancy registry, which enrolled 3,958 pregnant participants. By the March 30, 2021 cutoff, 827 pregnancies had concluded (104 miscarriages, 712 live births, 11 other outcomes). A deleted letter to NEJM suggested excluding the 700 women who received their first vaccine dose in the third trimester, inflating the miscarriage figure to 82 %. Dr. Celine Gounder explained that this manipulation ignored the majority of completed healthy pregnancies.
In January 2021, Dr. Anthony Fauci texted Dr. Rochelle Walensky and Dr. Vivek Murthy about a “theoretical” miscarriage risk while publicly stating no red flags for pregnant vaccine recipients. The texts later resurfaced in Republican-led releases, fueling the controversy.
Data & Statistics
- NEJM registry: 104 miscarriages / 827 completed pregnancies = 12.6 % (within the typical 10-26 % background rate).
- CDC follow-up (2021) of 2,456 women vaccinated before conception or before 20 weeks: 14 % miscarriage rate (weeks 6-<20).
- Norwegian registry of 421,201 pregnancies: 13 % miscarriage rate.
- Dr. James Thorp’s testimony cited 104 miscarriages / 127 remaining after removing third-trimester births, producing a miscalculated 81.9 %.
Official Statements & Responses
The Society for Maternal-Fetal Medicine (SMFM) reiterated its September 2025 statement that research shows no increased miscarriage or preterm-delivery risk from COVID-19 vaccination during pregnancy. The American College of Obstetricians & Gynecologists (ACOG) continues to recommend COVID-19 vaccines and boosters for those contemplating pregnancy, citing a 2024 study confirming vaccine safety.
Criticism & Opposition
Former GOP congressman Joe Walsh called the statement “malicious and dangerous disinformation.” Michigan Rep. Lisa McClain repeated the 82 % figure on Fox Business, prompting a network correction and on-air clarification by host Elizabeth MacDonald.
Verbatim Quotes
- “We now have the receipts: Dr. Fauci and Pfizer knew the second dose of the COVID vaccine carried an 82% risk of miscarriage for women in their first trimester.” — Sen. Ted Cruz
- “Cruz asked me for the evidence in April 2021, and I sent it to his committee,” — Dr. Celine Gounder
- “Someone took the 827 completed pregnancies in that registry, removed the 700 women who were vaccinated in the third trimester and had healthy babies, and divided by what was left,” — Dr. Celine Gounder
Conflicting Reports & Gaps
Cruz and allies reference an 82 % figure derived from a selective re-calculation, while peer-reviewed studies report rates between 12.6 % and 14 %, aligning with historical background rates. The original NEJM authors warned that early data “oversamples losses” and that a full-cohort analysis is needed, a caveat not reflected in the misinterpreted statistic.
Why It Matters
The episode shows how selective data interpretation can amplify misinformation during a public-health crisis and affect vaccine confidence among pregnant individuals. It underscores the importance of transparent, peer-reviewed research and clear communication from health agencies.
Timeline
- April 14, 2021 – Dr. Gounder testifies before the Joint Economic Committee.
- March 30, 2021 – Registry cutoff: 827 pregnancies completed.
- January 2021 – Fauci texts Walensky and Murthy about theoretical miscarriage risk.
- Recent Wednesday – Cruz posts the 82 % claim; backlash ensues; post later removed.
