When a person with TB disease in his/her lungs coughs or sneezes, the TB bacteria are released into the air. Another person can then breathe the TB bacteria into his/her lungs. A person who breathes in the TB bacteria can become infected. This is called TB infection.

TB infection is also known as Latent Tuberculosis Infection (LTBI). When a person has TB infection, the TB bacteria have entered the body, but they are not growing and are dormant, or latent. With TB infection, a person does not feel sick and cannot give the TB bacteria to other people. A person with TB infection may develop TB disease in the future.

