Diphtheria is pathogenic only when infected with______________?
Correct answer: A. Beta phage
- A. Beta phage
- B. Alfa phage
- C. Lambda K12
- D. Delta Phage
Explanation
Corynebacterium diphtheriae becomes toxigenic after lysogenic infection with a beta phage carrying the diphtheria toxin gene. This phage-mediated conversion explains why not all strains cause toxin-mediated disease.
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