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Aim During a large outbreak of Shiga toxin-producing Escherichia coli (STEC) O104:H4 in Germany 2011 caused by Fenugreek sprouts, 56 cases of haemolytic uraemic syndrome (HUS) and 124 cases of STEC were notified in Hesse. Almost 50 % of these cases were linked to six clusters. Timely identification of vehicles was warranted to halt the outbreak. Subject and methods A retrospective cohort study was...