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Differentiation of the hot dog outbreak strains (ECII) from other strains of L. monocytogenes serotype 4b by PCR with primers derived from 4bSF7. Lanes: M, 100-bp molecular size marker XIV (Roche); 1 to 8, hot dog outbreak strains; 9 to 18, other serotype 4b strains from the categories shown in Table 1. PCR was done as described in Materials and Methods.
