The normal time required to culture mycobacterium TB is :: (A) 4-8 weeks, (B) 2-3 weeks, (C) 6-10 weeks, (D) 21 days
Answer is A. M. tuberculosis 4-8 weeks is required before growth is detected. New methods have decreased the time required for bacteriologic confirmation of TB to 2-3 weeks. Reference: Harrisons Principles of Internal Medicine, 18th Edition, Page 1350