A: First of all, Mycobacterium tuberculosis is difficult to work with.
答：首先，结核分枝杆菌很难处理。
Current or previous infection with Mycobacterium tuberculosis was the end point.
目前或以前感染结核分枝杆菌的结核病作为实验的终点。
Current or previous infection with Mycobacterium tuberculosis was the end point.
目前或以前感染结核分枝杆菌的结核病作为实验的终点。
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