Multiplex PCR for the detection of sea, seb, sec, sed and see genes of Staphylococcus aureus: characterization of isolates from food.

Multiplex PCR for the detection of sea, seb, sec, sed and see genes of Staphylococcus aureus. Characterization of isolates from food. The presence of Staphylococcus aureus in food represents a potential risk to public health, being its enterotoxins the major virulence factor. Enterotoxin detection can be determined by ELISA, but only for the pool of enterotoxins SEA, SEB, SEC, SED and SEE. The main aims of this study were to optimize two PCR techniques for detection of S. aureus sea, seb, sec, sed and see, and to characterize Staphylococcus spp. isolates associated with food intoxication. Two PCR techniques were optimized and 115 Staphylococcus spp. isolates from Ciudad Autonoma de Buenos Aires, and Buenos Aires, Cordoba, and Neuquen provinces were characterized. The characterization was performed by biochemical tests, ELISA and PCR. Sixty-eight isolates (59.1%) were positive by ELISA, while 61 (53%) were positive by PCR. Out of the positive PCR isolates, 34 (55.7%) carried the sea gene, 9 (14.8%) the seb gene, 5 (8.1%) the see gene, 4 (6.5%) the sec gene, 6 (9.9%) were positive for sea and seb genes, 2 (3.3%) for sea and sec genes, and 1 (1.7%) for sea and sed genes. This is the first study of genotypic characterization of S. aureus isolates associated with food intoxication from different provinces of Argentina.