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Research published this week shows that animal feeding operations continue to be a problem in terms of E. coli outbreaks linked to leafy greens. As evidenced by outbreaks from Shiga toxin-producing E. coli (STEC) from 2009 to 2021, leafy greens growing fields can be contaminated in a variety of ways related to animal operations such as feedlots and grazing pastures, according to a study published in the Journal of Food Protection.