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.
Pulmonary tuberculosis is the most common form of tuberculosis. Bacteria that cause tuberculosis could also spread from the lungs to other parts of the body through blood or the lymph fluid. An active TB disease of the lungs, airways, or larynx is considered to be highly contagious.Factors that are associated with contagiousness include the presence of cough and cavity in lungs.The causative bacteria can spread to others when a person affected by pulmonary tuberculosis disease coughs or sneezes.n active TB disease of the lungs, airways, or larynx is considered to be highly contagious. Factors that are associated with contagiousness include the presence of cough and cavity in lungs. The causative bacteria can spread to others when a person affected by pulmonary tuberculosis disease coughs or sneezes.