Fact check: Do COVID-19 vaccines cause an 82% miscarriage rate?
Johnson cited a study as showing an 82% miscarriage rate, a claim PolitiFact says misrepresented the study’s data.

SOURCE CHECK
TAP FOR WHYCredibility rates KHBS, where this article appeared. The other scores rate the article itself.
The article identifies itself as PolitiFact reporting republished through a fact-checking partnership with Hearst Television. PolitiFact’s named fact-checking work and the explicit attribution support a solid credibility rating, though this page does not identify an individual author.
- Source type — Published by a local television outlet, with the underlying report explicitly credited to PolitiFact.
- Transparency — The page discloses that the article originally appeared on PolitiFact.com and was republished through a partnership.
- Editorial standards — The report presents its fact-checking conclusion alongside supporting study details and attributed expert commentary.
- Author attribution — No individual author is identified in the available article text.
The fact check explains the study denominator and the basis of Johnson’s calculation with specific figures, describes follow-up and later research, and includes a response from Johnson’s spokesperson. It relies substantially on research findings and expert commentary, while offering limited detail about opposing scientific interpretations.
HOW WE SCORE ↗The article includes Johnson’s claim and his spokesperson’s explanation, then tests them against the study’s details and subsequent research. The opposing account is substantially more developed, but the fact-checking focus and evidence are made explicit.
- Source diversity — The report draws on study findings, expert commentary, and the spokesperson’s account.
- Omitted context — The article provides substantial context on the denominator and later research, but does not develop a broader defense of Johnson’s interpretation.
- Counterarguments presented — Johnson’s claim and his spokesperson’s response are included.
- Loaded language — The wording is generally factual; “misrepresented” and “False” are tied to the stated fact-check conclusion.
The article reaches a negative fact-check verdict on Johnson’s claim, but its presentation is centered on the study data and attributed evidence rather than partisan language. Its critical conclusion follows the reporting described in the article.
- Language tone — Mostly factual and restrained, with the conclusion stated as a fact-check rating.
- Source selection — Uses published studies, a named expert, and a response from Johnson’s spokesperson.
- Framing — Frames the story as an examination of Johnson’s specific statistical claim.
- Headline — The headline poses a question about the claim rather than asserting a partisan conclusion.
Cites Politifact
This article cites Politifact as its original publisher. ChamberLight has not verified that it is a republication, so the scores are KHBS's own.
20 stories · 82–84 · updated Oct 1, 2026
This is Politifact's own score. The Source Check scores are for KHBS and this article.
Sen. Ron Johnson said texts and a 2021 study showed an 82% miscarriage rate after COVID-19 vaccination, but PolitiFact found he misrepresented the study’s denominator. The fact check cites later research finding no elevated miscarriage risk.
Johnson argued that Fauci’s text messages showed health officials knew of miscarriage risks and cited a 2021 study as evidence of an 82% miscarriage rate. PolitiFact reported that the study initially found 104 miscarriages among 827 completed pregnancies, but most of those pregnancies were already in their third trimester when participants were vaccinated. Johnson’s 82% calculation excluded those pregnancies and counted only early-vaccinated participants whose pregnancies had already ended by the study cutoff.
The article says a follow-up study found a cumulative miscarriage risk of 12.8% to 14.1%, and describes other research with similar findings. It also reports that a 2026 study found a 13.5% cumulative risk among 12,097 women vaccinated before 20 weeks of pregnancy. PolitiFact concluded that Johnson misrepresented the study and rated his statement “False.”
Community verdict
21 VOTESPeople in this story
SWIPE →Senator whose claim about miscarriage rates the article fact-checks
Then-nominee for surgeon general who asked Fauci about vaccination timing during pregnancy
Former president referenced in connection with his health officials
Then-director of the Centers for Disease Control and Prevention, included in the text message chain
Senator who released Fauci’s text message chains 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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