Agarose gel electrophoresis of the PCR products obtained from multiplex PCRs 1 and 2 in the assay. Lane MW, 100-bp DNA ladder marker; lane A, serogroup A; lane B, serogroup B; lane I/K, serogroup I/K; lane 29E, serogroup 29E; lane C, serogroup C; lane H, serogroup H; lane L, serogroup L; lane X, serogroup X; lane W135/Y, serogroup W135/Y; lane Z, serogroup Z.