Conventional light microscopy of Ziehl-Neelsen-stained smears prepared directly from sputum specimens is the most widely available test for diagnosis of tuberculosis (TB) in resource-limited settings. Ziehl-Neelsen microscopy is highly specific, but its sensitivity is variable (20–80%) and is significa...

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Direct sputum smear microscopy is the most widely used means for the diagnosis of pulmonary tuberculosis (TB) and is available in most primary health-care laboratories at health-centre level. Smear microscopy may, however, be costly and inconvenient for patients, who have to make multiple visits to healt...

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