What test is used to quickly distinguish streptococci from other Gram-positive cocci like staphylococci?

Understand the Problem

The question is asking about a specific laboratory test that differentiates streptococci from other types of Gram-positive cocci, particularly staphylococci. This involves understanding the characteristics of these bacteria and the methods used in microbiology for identification.

More Information

The catalase test works by detecting the presence of catalase enzyme, which is present in staphylococci (catalase-positive) but not in streptococci (catalase-negative). The test is performed by adding hydrogen peroxide to a bacterial culture and observing if bubbles form, indicative of oxygen release.

Tips

A common mistake is assuming that all Gram-positive cocci are catalase-positive. However, streptococci are catalase-negative, which is key to distinguishing them from staphylococci.

Sources

• The web page with info on - UWyo - uwyo.edu
• Streptococci - Overview of Detection, Identification, Differentiation - Sigma Aldrich - sigmaaldrich.com