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Fig. 2 —Semiquantitation of sputum acid-fast bacilli over time. Changes over time in pulmonary uptake of ⁶⁷Ga citrate corresponding to varied burden of pulmonary Mycobacterium tuberculosis, indicated by semiquantitations of sputum acid-fast bacilli in enrolled patients receiving anti-TB treatment. Because plots from different patients in same chronologic assessment overlapped each other, Arabic numerals indicating numbers of overlapped plots were put in circles representing plots for specific intensity of pulmonary ⁶⁷Ga uptake.