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Why do children develop juvenile rheumatoid arthritis (JRA)?

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Researchers still don't know exactly why the immune system goes awry in children who develop juvenile rheumatoid arthritis (JRA), although they suspect that it's a two-step process. First, something in a child's genetic makeup gives them a tendency to develop JRA. Then an environmental factor, such as a virus, triggers the development of JRA.

SOURCE: 

National Institute of Arthritis and Musculoskeletal and Skin Diseases.

Reviewed by David Zelman on January 30, 2019

SOURCE: 

National Institute of Arthritis and Musculoskeletal and Skin Diseases.

Reviewed by David Zelman on January 30, 2019

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What other parts of the body can juvenile rheumatoid arthritis (JRA) affect?

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