An inhibitor typing scheme applicable to Lancefield group E streptococci.

Area of Science:

• Microbiology
• Bacteriology

Background:

• Hemolytic streptococci are significant pathogens.
• Group E streptococci require specific identification methods.
• Existing typing schemes may have limitations for certain strains.

Purpose of the Study:

• To evaluate a novel inhibitor typing scheme for group E streptococci.
• To assess the scheme's ability to differentiate and characterize strains.
• To determine the stability and utility of the proposed typing system.

Main Methods:

• Utilized a previously described inhibitor typing scheme.
• Tested 12 well-characterized strains of group E streptococci.
• Assessed inhibitor production (P-type) and sensitivity (S-type) under varying conditions, including anaerobic incubation.

Main Results:

• Differentiated strains into five inhibitor production (P) types and four inhibitor sensitivity (S) types.
• Identified seven unique strain "fingerprints" (P-type and S-type combinations).
• Observed increased inhibitor production under anaerobic conditions; fingerprints remained stable upon repeated testing.

Conclusions:

• The inhibitor typing scheme is valuable for differentiating group E streptococci.
• The scheme aids in the classification of serologically untypable strains.
• It offers a method for subdividing strains within existing serotypes, enhancing strain characterization.