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People without Rh factor on the surface of their blood cells are Rh-negative and have Rh incompatibility with blood that is Rh

Rh sensitization happens if you have Rh-negative blood and are exposed to Rh-positive blood. Because the blood types don't match

Rheumatic fever results from an infection caused by certain strains of streptococcal bacteria and may be triggered by a strep

Rheumatic heart disease is inflammation and damage to the heart muscle and heart valves that develop as a result of rheumatic

Rheumatoid arthritis is a type of arthritis in which your body's immune system attacks healthy tissue in your joints. This makes

The retina is a thin nerve membrane that detects light entering the eye. Nerve cells in the retina send signals of what the eye

A ruptured (or perforated) eardrum is a tear or hole in the membrane of the middle ear. It's usually as a result of injury (trauma

Rickets is a rare disease that results in soft, weak, and pliable bones. It is caused mainly by a lack of vitamin D. Rickets most

Ringworm of the scalp is an infection that grows in the outer layer of the scalp and in the hair. It is caused by a fungus, not by

Rocky Mountain spotted fever is a bacterial infection passed to humans by wood ticks and dog ticks that can lead to life