RESUMO
OBJECTIVE: A predictive model for Yersinia enterocolitica growth in MTSB at different temperatures was studied. According to this model, if food has been contaminated by a few Yersinia enterocolitica, the growth rate, generation time, lag time and total bacterial number at any time and any effective temperature can be predicted. Under the same condition, the parameters for Yersinia enterocolitica serotype O:3 and Yersinia enterocolitica O:9 were compared, respectively. RESULTS: 1. The minimum growth temperature for Yersinia enterocolitica serotype O:3 and O:9 were--17.8 degrees C and--10.3 degrees C, respectively. 2. In the range of 4 degrees C and 30 degrees C, the growth rate of Yersinia enterocolitica serotype O:3 or O:9 increase with temperature going up. 3. In the range of 4 degrees C and 15.7 degrees C, the growth rate of Yersinia enterocolitica serotype O:3 is higher than that of Yersinia enterocolitica serotype O:9. In the range of 15.7 degrees C and 30 degrees C, the growth rate of Yersinia enterocolitica serotype O:9 is higher than that of Yersinia enterocolitica serotype O:3. 4. We get a predictive model for Yersinia enterocolitica in MTSB: Yersinia enterocolitica serotype O:3, square root of M = 0.0134 (T-255.1866). Yersinia Enterocolitica serotype O:9, square root of M = 0.0173 (T-262.7457).
