An MPN test where a positive EMB test (presence of metallic green colonies)has been observed is known as a:

Question

Quizplus · Accepted Answer

A positive EMB test, indicated by the presence of metallic green colonies, is considered a confirmed test. This is because the EMB (Eosin Methylene Blue) agar specifically inhibits the growth of Gram-positive bacteria and allows for the identification of lactose-fermenting Gram-negative bacteria, such as E. coli, which produce the characteristic metallic green sheen. This step follows the presumptive test in the water testing process, providing confirmation of the presence of coliform bacteria.

An MPN Test Where a Positive EMB Test (Presence of Metallic