This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Koch's postulate is not fulfilled by ? 
Select and explain. 
A. M. tuberculosis, B. Gonococci, C. Staph aureus, D. Bacillus Anthracis
B: Gonococci
Answer: B: Gonococci 
Explanation: Ans. is 'b' i.e., Gonococci Koch postulates Robe Koch proposed a series of postulates that have been applied broadly to link many specific bacterial species with paicular disease. Koch's postulates are : The microorganism should be found in all cases of the disease in question and its distribution in the body should be in accordance with the lesions observed. The microorganism should be grown in pure culture in vitro (or outside the body of the host) for several generations. When such a pure culture is inoculated into susceptible animal species, the typical disease must result. The microorganism must again be isolated from the lesions of such experimentally produced disease. o Microorganisms that do not meet the criteria of Koch's postulates. Mycobacterium leprae (leprosy) Treponema pallidum (syphilis) Neisseria gonorrhoeae No animal model for experimental infection Microorganism that paially satisfy the postulates. q E. coli induced diarrhea.