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Tail-vein infection with low-dose (5 × 102) Erdman wild type (◆), M. tuberculosis H37Rv wild type (■), mce1 operon mutant (▲), and mce1R mutant (●). Antibiotics were given for 4 weeks in each group. Mice in panel A were treated with dexamethasone, while those in panel B were not. The cfu recovery from lungs is shown as the mean value ± SD of three mice per group at the indicated periods of infection. Dotted line (----) indicates a limit of detection.
