| http://www.w3.org/ns/prov#value | - The first symptom is a high fever that lasts for at least 5 days.Immune System The immune system, composed of special cells, proteins, tissues, and organs that protect against germs and microorganisms, is the body's defense against disease.Juvenile Idiopathic Arthritis Juvenile idiopathic arthritis (also called juvenile rheumatoid arthritis) affects some 50,000 kids in the United States.
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