Discussion
Streptolysin O is
Answer: D
Correct answer: all of these
Streptolysin O is antigenic, which is why the antistreptolysin O titre can be measured and used to establish a recent infection. It is oxygen-labile, being inactivated by atmospheric oxygen, which is why the haemolysis it produces is best seen in a stab or under a coverslip. And it is heat-labile. Streptolysin S is the opposite on the first two counts: oxygen-stable and non-antigenic.
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