Share +. Text A A A. Rheumatoid arthritis (RA) is an autoimmune disease where the body's immune system attacks normal joint tissues, causing inflammation of the joint lining. This inflammation of the joint lining (called the synovium) can cause pain, stiffness, swelling, warmth, and redness.ext A A A. Rheumatoid arthritis (RA) is an autoimmune disease where the body's immune system attacks normal joint tissues, causing inflammation of the joint lining.
Tuberculosis. Tuberculosis (TB) is an infectious disease caused by a bacterium that usually attacks the lungs. TB is spread through the air from one person to another. The bacteria are put into the air when a person with active TB disease of the lungs or throat coughs, sneezes, speaks, or sings.
Tuberculosis is a contagious disease that spreads when an infected person coughs or sneezes. This shoots droplets contaminated with M. tuberculosis bacteria into the air where they can be inhaled into the lungs by others.eople with latent tuberculosis are not contagious and cannot spread the disease to others. However, anything that stresses the immune system, such as malnutrition or a chronic disease, can lower the bodyâs resistance and allow the bacteria to become active and multiply in the body.