Development of Yersinia enterocolitica -like Organisms in Pure and Mixed Cultures on Different Bismuth Sulfite Agars.

Yersinia enterocolirica -like isolates from meats produced, black colonies on eight of nine lots of bismuth sulfite agar. Differences were observed in size and black metallic sheen of colonies on different lots of this medium. In addition, inhibition of Pseudomonas spp, differed among lots.