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Number of positive plates and cumulative percentage per day of reading. Sm+, sputum smear microscopy positive; Sm−, sputum smear microscopy negative. Indication of median positivity and drug susceptibility results for rifampicin-susceptible (S) isolates (black line with dashes and dots), rifampicin-resistant isolates with mutations different from I491F (solid black line), and rifampicin-resistant isolates with I491F mutation only (dashed black line).
