E. Coli Linked To Cancer

In 2025, researchers linked the rise of colon cancer in adults under 50 to early-life exposure to colibactin, a DNA-damaging toxin made by certain strains of E. coli and related gut bacteria. The study found colibactin-linked mutations more often in tumors from younger colorectal cancer patients, and researchers said the damage may begin in the first 10 years of life.

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