In the MPN test,at which stage would the first identification of coliforms organisms occur?

Question

Quizplus · Accepted Answer

The first identification of coliform organisms occurs during the presumptive stage of the MPN test. This stage is used to determine the presence or absence of coliforms in a water sample based on their ability to produce gas in the lactose fermentation broth. If gas production is observed, it indicates the presence of coliforms in the sample. However, this stage does not provide conclusive evidence of the presence of coliforms, which requires further confirmation in subsequent stages of the MPN test.

In the MPN Test,at Which Stage Would the First Identification