Only a small number of the bacilli need to be inhaled to cause an infection.

只需要吸入少量杆菌就可造成感染。

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But people infected with TB bacilli will not necessarily become sick with the disease.

但是，感染结核杆菌的人不一定患病。

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But people infected with TB bacilli will not necessarily become sick with the disease.

但是，感染结核杆菌的人不一定患病。

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