u*****d 发帖数: 1009 | 1 http://www.goaskalice.columbia.edu/0354.html
A positive result for tuberculosis means that sometime in your life, you
breathed TB germs into your lungs. The germs make some people sick soon after
they enter the body, causing TB disease. In most cases, the body's immune
system controls the disease by building a wall around the germs the way a scab
forms over a cut. The germs stay alive inside your body, but are inactive.
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