| isolation of yersinia from raw meat (pork and chicken) and precooked meat (porcine tongues and sausages) collected from commercial establishments in mexico city. | a total of 160 meat product samples were collected from commercial outlets in mexico city to investigate the presence of different species of yersinia by the 4 degrees c enrichment method after 1, 3, 5, and 7 days of incubation using alkaline treatment and isolating in cefsulodin-irgasan-novobiocin and macconkey agars with tween 80. overall, yersinia spp. were isolated from 27% of the samples analyzed, whereas 40% of the raw and only 13% of the precooked samples were contaminated. although 2,970 ... | 2000 | 10772223 |