A) Cholera
B) Leprosy
C) TB
D) Diphtheria
Correct Answer: B
Solution :
To apply Koch's postulates, we have to culture the suspected causal organism in vitro. Mycobacterium leprae cannot be cultured in vitro. Hence, Koch's postulates are not applicable to leprosy because its incubtion period is 2-5 years. Cholera is caused by Vibrio cholerae. TB is caused by Mycobacterium tuberculosis. Diphtheria is caused by Mycobacterium diphtheriae.
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