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Fact-check: “An amphibian gut bacterium is 100% effective in destroying cancer cells in rats.”

Verdict: Misleading (82% confidence)

A December 2025 peer-reviewed study in Gut Microbes does document that Ewingella americana, isolated from amphibian gut, achieved a 100% complete response rate eliminating colorectal tumors in a mouse model — so the '100% effective' figure is real. But the claim says 'rats' when the study used BALB/c mice (n=5 per group), and the model was subcutaneous tumor implantation, not an orthotopic or clinical-grade cancer scenario. Those two inaccuracies — wrong species and a simplified, small-sample p…

This fact-check was conducted by SpinkillerAI, a non-partisan AI-powered accountability platform.

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