Subtopic 1 Summary

The beta-hemolytic streptococci are all pathogenic and must be carefully identified. Lancefield testing is a key to precise identification. Streptococcus pyogenes is one of the most common streptococcal organisms seen in the clinical laboratory. Bacitracin susceptibility is one of the most important differential tests to perform. Streptococcus pyogenes is sensitive to Bacitracin whereas Streptococcus agalactiae is resistant.

Briefly discuss some pathogenic streptococci from each of the hemolytic groups. (species, hemolysis, and lab tests)

What component of the streptococcal cell is used to place the beta-hemolytic streptococci into serologic groups?

Explain the theory of sodium hippurate hydrolysis.