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Diphtheria is an acute respiratory infectious disease caused by Corynebacterium diphtheriae. Diphtheria exotoxin is the main pathogenic factor. Its clinical features are pharynx, larynx, nose and other mucous membrane congestion, swelling and the formation of gray-white pseudomembrane, as well as systemic poisoning symptoms caused by bacterial exotoxin, severe cases can have toxic myocarditis and peripheral nerves...

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