Figure 1.

Map of China showing the distribution of the tuberculosis patients whose isolates of Mycobacterium tuberculosis were included in the study. The selected study field sites were Pingguo county, Guangxi Province; Wusheng county, Sichuan Province; Weishi county, Henan Province; Songjiang District, Shanghai; Fei county, Shandong Province; and Wuchang county, Heilongjiang Province. The markers on the map indicate the relative location of the 6 study sites. The star represents the national capital, Beijing city.