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without blood or fecal leukocytes. not at 37°C, and highly virulent to mice.
A comprehensive treatment of E. coli Serotyping is very important in separating
O157 : H7 and other E. coli strains, as well as this organism from other closely related
many food-borne pathogens, can be found in Gram-negative bacteria. Although Y. entero-
the book by Doyle, Beuchat, and Montville colitica has an optimal growth temperature at
(1997). around 32° to 34°C, it is often isolated on
Prevention and control of pathogenic E. enteric agars at 22° to 25°C. It grows slowly
coli is best done by educating food-handlers, in simple glucose-salts medium but grows
who should adhere to strict hygienic prac- much better with supplements such as methi-
tices
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