What is Juvenile Idiopathic Systemic juvenile idiopathic arthritis? There are six JIA subtypes.
JIA was previously called juvenile rheumatoid arthritis, or JRA. Systemic JIA is considered an autoinflammatory disease. The other types are considered autoimmune diseases. A healthy immune system fights invaders, such as viruses and bacteria. In people with autoimmune or inflammatory diseases, the immune system doesn’t work properly. It becomes overactive even when there is no infection to fight, or it mistakenly attacks healthy cells and tissues. 2 weeks and a skin rash.
About 10 percent of children with JIA will have the systemic form. Polyarthritis can be rheumatoid factor-positive or negative. Rheumatoid factor-positive polyarticular, JIA closely resembles adult rheumatoid arthritis and can be a more severe disease than the RF-negative variation. About 25 percent of children with JIA will have the polyarticular form. The psoriasis may begin many years before any joint symptoms become apparent.