The person given the TST must return within 2 or 3 days to have a trained health care worker look for a reaction on the arm where the liquid was injected. This is different from a Bacille Calmette-Guerin (BCG) shot (a TB vaccine that many people living outside of the United States receive). When injected, a small, pale bump will appear.
Using a small needle, a health care provider injects a liquid (called tuberculin) into the skin of the lower part of the arm. The Mantoux tuberculin skin test is a test to check if a person has been infected with TB bacteria. There are two kinds of tests that are used to determine if a person has been infected with TB bacteria: the tuberculin skin test and TB blood tests. People with TB disease can spread the bacteria to others, feel sick, and can have symptoms including fever, night sweats, cough, and weight loss. Some people with latent TB infection go on to develop TB disease. People with latent TB infection do not feel sick, do not have TB symptoms, and cannot spread TB bacteria to others. TB bacteria can live in the body without making a person sick. TB usually attacks the lungs, but can also attack other parts of the body, such as the brain, spine, or kidneys.
When someone who is sick with TB coughs, speaks, laughs, sings, or sneezes, people nearby may breathe TB bacteria into their lungs. Tuberculosis (TB) is a disease that is spread through the air from one person to another.
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