AN INTERNATIONAL OUTBREAK OF SHIGA TOXIN-PRODUCING ESCHERICHIA COLI O157 INFECTION DUE TO LETTUCE, SEPTEMBER - OCTOBER 2007 von FRIESEMA, I, SIGMUNDSDATTIR, G, GUDMUNDSDOTTIR, E, VAN PELT, W, VAN DER ZWALUW, K, HEUVELINK, A, SCHIMMER, B, DE JAGER, C, RUMP, B, BRIEM, H, HARDARDOTTIR, H, ATLADOTTIR, A

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