Colibactin DNA-damage signature indicates mutational impact in colorectal cancer | Nature Medicine
https://www.nature.com/articles/s41591-020-0908-2
The exact mechanism of how E.coli bacteria cause colonic cancer has been found: "Colibactin"--a potent toxin associated with certain strains of Escherichia coli--creates a specific DNA-damage signature in infected human colorectal cells. These DNA breaks are the precursors​ of human colon cancer. : science
https://www.reddit.com/r/science/comments/hbz1fd/the_exact_mechanism_of_how_ecoli_bacteria_cause/