Examination of Enterotoxin Production at Low Temperature by Yersinia spp. in Culture Media and Foods.

Sixteen of 27 (59%) cultures of Yersinia spp. produced enterotoxin measured by the suckling mouse assay at 25°C in aerated broth culture media. Only one of 15 of these cultures, which was identified as Yersinia kristensenii , produced enterotoxin at 6°C. No enterotoxin was detected in water and methanol extracts of 6 food slurries inoculated with this toxigenic culture after incubation at 9.8°C for 4 d.

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