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Multiplex PCR products of STEC O103 strains representing three groups. The strains used were 082589 and 111155 for O103:H2/[H2], 072676 and 071049 for O103:H11/[H11], 090688 and 082332 for O103:H25/[H25] and three non-O103 strains expressing either H2, H11, or H25 antigen. M, 100-bp DNA ladder markers.
