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In a 2-year prospective study of tuberculosis (TB) patients in China, the prevalences of non-Beijing strains of Mycobacterium tuberculosis varied between Shandong Province (20.6%), Shanghai (27.6%), and Sichuan Province (45.9%) (P < 0.005). These differences may be due to factors such as human migration, transmission, or diversification and adaptation of the mycobacteria to different hosts.
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Li et al. (2010) studied this question.
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