Tuberculosis is a lung infection caused by the bacteria Mycobacterium tuberculosis. . This is an air-borne bacteria that can spread through the air and has high chances of infectivity. Once inside the lungs, our immune system contains the infection and fights it. In the majority of cases, tuberculosis bacteria will be in a dormant stage, with no visible signs or symptoms. As long as the immune system is active and it will contain the bacteria, no symptoms are evident. If neglected or in immunocompromised condition, latent tuberculosis can progress to an active stage, in which the disease with symptoms manifests itself. Bacteria begin to damage tissue in the active stage. Fever, cough, cough with blood, chest pain, shortness of breath, night sweats, unexpected and unexplained weight loss, and weariness are some of the symptoms. Tuberculosis primarily affects the lungs, but it can also affect the brain, spine, joints, kidneys, and other organs.