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.
Communicable diseases can be broken down into five different categories: respiratory diseases (common cold and pneumonia), intestinal diseases (dysentery, cholera, typhoid, paratyphoid fevers), insect borne diseases (malaria, typhus, yellow fever, dengue), sexually transmitted diseases (syphilis, gonorrhea, chancroid, AIDS), and miscellaneous diseases (tetanus, rabies, dermatophytosis, tuberculosis).