Fact check: Do COVID-19 vaccines cause an 82% miscarriage rate?
Johnson cited a study to claim an 82% miscarriage rate, but the article says he misrepresented its data.

SOURCE CHECK
TAP FOR WHYCredibility rates WLKY, where this article appeared. The other scores rate the article itself.
The reporting is attributed to PolitiFact and republished through an identified fact-checking partnership with Hearst Television. PolitiFact is an established fact-checking outlet, though the page does not identify an individual author.
- Source type — Local television publisher republishing a PolitiFact fact check through a stated partnership.
- Editorial standards — The article identifies the underlying study, follow-up research, and the basis for its ruling.
- Transparency — The page explicitly names PolitiFact as the original publisher and identifies the Hearst Television partnership.
- Author attribution — No individual author is named in the supplied article text.
The fact check explains the denominator error with study figures, describes subsequent research, and attributes responses and expert comments. It provides substantial evidence, although the article does not include an independent response from Johnson himself beyond his spokesperson’s explanation.
HOW WE SCORE ↗The article explains Johnson’s reasoning and includes his spokesperson’s explanation, then presents study data and subsequent research that contradict his claim. The piece is purposefully a fact check, so it gives more space to evaluating the evidence than to arguments supporting Johnson’s interpretation.
- Counterarguments presented — Johnson’s claim and his spokesperson’s explanation are included, but the article finds the interpretation incorrect.
- Source diversity — The article draws on published studies, a researcher’s findings, and an expert comment, but has limited direct response from Johnson’s side.
- Opinion vs reporting — It is presented as a fact check and bases its ruling on described evidence.
- Omitted context — It explains the relevant denominator and follow-up findings, though the competing interpretation receives less attention.
The article uses a fact-check format, attributes Johnson’s claim and his spokesperson’s explanation, and evaluates the claim against study data and later research. Its critical conclusion follows the evidence presented rather than an evident partisan framing.
- Language tone — Mostly neutral explanatory language; the evaluative term “False” appears as the stated fact-check ruling.
- Framing — The framing tests a specific statistical claim against the study’s methods and later findings.
- Source selection — The article includes Johnson’s stated basis and his spokesperson’s response, alongside research and an expert comment.
Cites Politifact
This article cites Politifact as its original publisher. ChamberLight has not verified that it is a republication, so the scores are WLKY's own.
20 stories · 82–84 · updated Oct 1, 2026
This is Politifact's own score. The Source Check scores are for WLKY and this article.
Sen. Ron Johnson claimed a 2021 study showed an 82% miscarriage rate after early COVID-19 vaccination, but the article says he misused the study’s denominator. It reviews follow-up and later research that found miscarriage risks within the usual range.
Sen. Ron Johnson argued that Fauci’s text messages showed health officials knew of miscarriage risks from COVID-19 vaccination. Johnson cited a 2021 study and said it found an 82% miscarriage rate among women vaccinated in the first or second trimester. His spokesperson said he was quoting an open letter by an OB-GYN who has argued that the vaccines increase miscarriage risk.
The article explains that the 82% figure came from excluding 700 pregnancies that had not ended, leaving a denominator of 127 early-vaccinated women whose pregnancies had already ended by the study cutoff. It says a follow-up study found a cumulative miscarriage risk of 12.8% to 14.1%, and describes other studies with similar findings. The article rates Johnson’s statement “False.”
Community verdict
14 VOTESPeople in this story
SWIPE →Senator whose claim about miscarriage rates after COVID-19 vaccination is fact-checked
Then-nominee for surgeon general who asked Fauci about vaccination timing during pregnancy
Former president referenced in describing officials who exchanged messages with Fauci
Then-director of the Centers for Disease Control and Prevention, included in the text-message exchange
Senator who released Fauci’s text messages with Johnson
Part of a bigger story
16 OUTLETSRon Johnson and Rand Paul released messages from Anthony Fauci’s government phone discussing COVID-19 vaccination during pregnancy. Center outlets focus on fact-checking Johnson’s 82% miscarriage-rate claim and explaining what the study data and later research show. Right-leaning outlets stress the contrast between Fauci’s private messages and public assurances, alongside Johnson’s pursuit of records or testimony.
- ARTICLES
- 19
- OUTLETS
- 16
- AVG CRED
- 66
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