A vaccine for TB. BCG is not widely used in the United States, but it is often given to infants and small children in other countries where TB is common.

A picture of the inside of your chest. A doctor can look at a chest x-ray to see whether TB bacteria have damaged your lungs.

A person who has spent time with a person with infectious TB.

A test to see whether there are TB bacteria in your phlegm or other body fluids.

A way of helping patients take their medicine for TB. If you get DOT, a health care worker meets with you every day or several times a week to make sure you are taking your medicine.

Infection with the human immunodeficiency virus (HIV), the virus that causes AIDS (acquired immunodeficiency syndrome). A person with both latent TB infection and HIV infection is at very high risk for active TB disease.

Bacteria that cause latent TB infection and active TB disease.

Usually refers to a test result. If you have a negative TB skin test reaction, you probably do not have TB infection.

Usually refers to a test result. If you have a positive TB skin test reaction, you probably have TB infection.

A test to see whether there are TB bacteria in your phlegm.