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E coli nissle 1917 warning

Don't know if any of you are using or considering a probiotic called e coli nissle 1917 but there are a few articles in the UK media today linking it potentially to increased bowel cancer risk. I'll try and post a link. They've basically found a certain type of e coli that produces some kind of toxin that is found more frequently in bowel cancer patients than healthy people and they suspect the probiotic might do the same.