For Acid Fast Bacilli (AFB) to be detected in sputum by the direct microscopy, the bacillary
burden in sputum typically is:
(a) 500–1,000 organisms
(b) 5,000–10,000 organisms
(c) 10,000–20,000 organisms
(d) Any number of organisms
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ANS- (b) 5,000–10,000 organisms