Fig. 3

Agarose 2% showing results of multiplex PCR for the detection of sea, seb, sec, and sed genes. Lane one shows a 100-bp molecular size standard DNA ladder. Lanes 2 and 4 were positive for seb (164 bp) and sed (278 bp), lane 3 was positive for sea (102 bp) and sec (451 bp), and lane 5 was positive for seb (164 bp)