A positive tube coagulase test is indicated by what?

A positive tube coagulase test is indicated by clotting of plasma. This test is primarily used to identify Staphylococcus aureus, a pathogenic bacterium. In the test, plasma is inoculated with the suspected bacterial isolate. If the organism produces coagulase, an enzyme that causes the clotting of plasma, you will observe a solid mass or clot formation. This reaction demonstrates the ability of the bacteria to coagulate fibrinogen in the plasma, leading to the production of fibrin and thus forming a gel-like clot. The presence of this clot signifies a positive result, indicating that the tested strain likely has pathogenic potential due to its coagulase production.