<prompt> All the following are true of Tuberculosis except ?For sputum to be positive, A194 bacilli should be 1Niacin test differentiates M. tuberculosis and M. bovisPathogenicity to rabbits differentiates M. tuberculosis and M. bovisAll  <response>: Ans. is c i.e., Pathogenicity to rabbits differentiates M. tuberculosis and M. bovis . Culture is a very sensitive diagnostic technique for detection of tubercle bacilli, detecting as few as 10 to 100 bacilliml. . At least 10, 000 109 acid fast bacilli should be present per mil of sputum for them to be readly demonstrable in direct smear. Differentiation between M. tuberculosis and M box is Type Nitrate reduction Niacin Oxygen preference Growth on TCH Pyrozinamide Growth culture . M. Tuberculosis . M. bovis ve -ve ve -ve Aerobic Microacrophilic - Senstive resistant Luxuriant eugonic Sparse dysgonic . About option c Pathogenecity to Rabbit is used to differentiate M bovis from BCG strain attenuated strain of M. bovis, not from M. tuberculosis. 