Streptolysin S

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Definition

noun

A nonantigenic, oxygen-stable β-hemolytic enzyme produced by some bacteria, especially streptococci.


Supplement

In blood agar, the streptolysin S forms a zone of β hemolysis around the colonies of streptococci. This compound is toxic to leucocytes, platelets and many cell lines.


Compare: streptolysin O
See also: hemolysin