Which hemolysin, produced by beta-hemolytic streptococci, is oxygen stable and non-antigenic?

The correct answer is Streptolysin S, which is produced by beta-hemolytic streptococci. This hemolysin is significant because it demonstrates unique properties that distinguish it from other hemolysins.

Streptolysin S is oxygen stable, meaning it can function in environments that contain oxygen, which is important for its activity in various physiological contexts. Its ability to operate in oxygenated conditions is in contrast to some other hemolysins that are not stable in such environments.

Additionally, Streptolysin S is considered non-antigenic. This means that it does not elicit a strong immune response in the host, making it less recognizable by the immune system compared to other hemolysins. This characteristic can facilitate the pathogenic capabilities of beta-hemolytic streptococci as it allows them to evade immediate immune detection, contributing to their virulence.

In summary, the categorization of Streptolysin S as oxygen stable and non-antigenic highlights its role in the pathogenicity of beta-hemolytic streptococci, making it key to understanding how these bacteria can cause disease.