Opacity around colonies of Clostridium perfringens is due to_________________?
Correct answer: B. Lecithinase
- A. Theta toxin
- B. Lecithinase
- C. Desmolase
- D. Cytokinin
Explanation
Lecithinase, or alpha toxin, hydrolyses lecithin in egg-yolk media and produces an opaque, opalescent zone around Clostridium perfringens colonies. Theta toxin is a separate haemolysin and does not cause this opacity.
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