What type of test is done to determine the presence of bacteria in a BAC-T sample?

The correct choice is the Present / Absent Test, which is specifically designed to detect the presence of bacteria in water samples, such as those collected for bacterial contamination testing. This test determines whether bacteria are present or absent in the sample, providing a straightforward and rapid indication of water quality. Its simplicity allows for quick decision-making, especially in situations where timely results are critical for public health.

In the context of water testing, when assessing for bacteria, public health is a primary concern, and knowing whether bacteria are present can dictate immediate action. Thus, the Present / Absent Test is an essential method for ensuring water safety.

In contrast, a qualitative test typically identifies the type of bacteria present but does not necessarily focus on their quantity, while a quantitative test measures the concentration of bacteria in the sample. The specific pathogen test aims to detect specific types of pathogens rather than providing a broad assessment of bacterial contamination. Each of these methods serves different purposes in microbiological testing, which highlights why the Present / Absent Test is particularly suited for indicating the presence of any bacteria in a sample.