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More recently, however, drugs extracted from biological sources -- called biologics -- have become available to treat polyarticular and systemic JIA.

The largest subtype of JIA is known as polyarticular JIA, which affects many joints.

Brooke was diagnosed with polyarticular juvenile idiopathic arthritis in 2012.

Kids like Shepherd, with polyarticular J.I.A. — meaning five or more joints affected — are unlikely ever to outgrow it; he would probably be on medication for life.