Agarose gel (1.5%) of multiplex PCR amplicons from different bacterial strains. Representative gel from three comparable experiments. Lanes 1 and 10, 100-bp DNA ladder (NEB, Ipswich, MA); lane 2, Escherichia coli (DH5a, negative control); lane 3, S. enterica group 2, according to Table 2; lane 4, S. enterica group 1, according to Table 2; lane 5, S. enterica serovar Enteritidis; lane 6, S. enterica serovar Heidelberg; lane 7, S. enterica serovar Kentucky; lane 8, S. enterica serovar Gallinarum biotype Pullorum; lane 9, S. enterica serovar Gallinarum biotype Gallinarum.