Abstract

Criteria for recognition of inaccurate quantitative coliform counts are described. Under abnormal conditions of visual dye coloration, and/or appearance of minute speck-like colonies dispersed throughout the media, it is possible to demonstrate the presence of coliform colonies in the violet red bile agar without evidence of any typical colonies on the original plate.It is recommended that plates under suspicion be confirmed by inoculating suspicious sections of agar into lactose and brilliant green bile broth or subjected to the completed test.

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