What is tuberculosis?
Tuberculosis (TB) is a serious infection caused by bacteria. It usually occurs in the lungs, but it can spread to other parts of the body. TB spreads to other people through the air. When someone with TB breathes out or coughs, the bacteria can be breathed in by people who are nearby. You should not go to work or school while you can infect other people.
If you live with other people, ask them to be tested for TB. A positive tuberculin skin test means that the person needs treatment to prevent TB.