Diphtheria toxin was discovered by

Paul Ehrlich

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Roux and Yersin

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Kleb and Loeffler

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Emil von Behring

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Solution

The correct option is C Roux and Yersin
Diphtheria toxin was discovered by Émile Roux and Alexandre Yersin in the year 1888. It is the toxin secreted by the bacteria called Corynebacterium diphtheriae and causes diphtheria. It consists of a single polypeptide chain of 535 amino acids. This causes diseases to humans by entering through the cytoplasm and thereby inhibiting protein synthesis.
So, the correct answer is option B.

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