她还说，这也可能是由于世界不同地方的结核分枝杆菌种群的遗传差异造成的。
It could also be caused by genetic differences between M. tuberculosis populations in different parts of the world, she adds.
她还说，这也可能是由于世界不同地方的结核分枝杆菌种群的遗传差异造成的。
It could also be caused by genetic differences between M. tuberculosis populations in different parts of the world, she adds.
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