This is a research study to test whether a once-weekly injection of abatacept will prevent the progression of Juvenile Idiopathic Arthritis (JIA) to a more severe form. To evaluate the effectiveness of a 24-week course of treatment with abatacept plus usual care versus usual care to prevent polyarthritis (≥5 joints), uveitis, or treatment with other systemic medication within 18 months of randomization in children with recent-onset limited JIA.
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Composite of All Primary Endpoints
Timeframe: From randomization to day 410
Number of Participants With Polyarthritis
Timeframe: From randomization to day 592
Number of Participants With Uveitis
Timeframe: From randomization to day 410
Number of Participants With Systemic Medications
Timeframe: From randomization day 410