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Agarose gel electrophoresis of PCR products amplified from whole cells of serotypes a through e. Lanes: 1 and 7, molecular size markers; 2 and 8, ATCC 29523 (serotype a); 3 and 9, JP2 (serotype b); 4 and 10, NCTC 9710 (serotype c); 5 and 11, IDH 781 (serotype d); 6 and 12, IDH 1705 (serotype e). PCR products in lanes 2 to 6 and lanes 8 to 12 were amplified with primers LKT2 and LKT3 and with multiplex primers, respectively.
