There are two possible ways a person can become sick with TB disease:
The first applies to a person who may have been infected with TB for years and has been perfectly healthy. The time may come when this person suffers a change in health. The cause of this change in health may be another disease like AIDS or diabetes. Or it may be drug or alcohol abuse or a lack of health care because of homelessness.
Whatever the cause, when the body's ability to protect itself is damaged, the TB infection can become TB disease. In this way, a person may become sick with TB disease months or even years after they first breathed in the TB germs.
The other way TB disease develops happens much more quickly. Sometimes when a person first breathes in the TB germs the body is unable to protect itself against the disease. The germs then develop into active TB disease within weeks.
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