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What is For sputum smear to come positive on ZN staining there should be minimum:- and explain in detail?
Sputum smear microscopy for tubercle bacilli is positive when there are at least 10,000 organisms present per ml of sputum. ZN staining in RNTCP: Acid fast bacilli of TB; 'Rod shaped' with 'beaded appearance'. >10,000 bacilli per ml sputum must be present for a positive result.