FIG. 1.

Agarose gel electrophoresis of PCR-amplified DNA extracted from food homogenates after inoculation with S. enterica serovar Enteritidis and incubation for 6 h at 37°C in BPW. Lanes: 1, DNA Molecular Weight Marker VI (Roche); 2, uninoculated food homogenate; 3 to 8, food samples inoculated respectively with 10⁴, 10³, 10², 10, 1, and 0 CFU per 100 ml of food homogenate; 9, PCR negative control; 10, pure culture of S. enterica serovar Enteritidis (positive control). The data shown are representative of three independent experiments.