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. 2013 Oct;19(10):1593–1604. doi: 10.3201/eid1910.121023

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Linear regression analysis showing correlation between average quantitative purified protein derivative (PPD) response and recent transmission index (RTI_n−1) for Mycobacterium tuberculosis complex isolates, The Gambia, 2002–2007. Open diamonds and dashed line, M. tuberculosis sensu stricto, including Euro-American (EA) lineage (R² = 0.606); open squares and dotted line, M. tuberculosis EA lineage (R² = 0.7272); black circles and solid line, M. africanum Afri_1 lineage (R² = 0.7732). sfu, spot-forming units.