CLINICAL TRIAL / NCT01357668

For more information regarding BMS clinical trial participation, please visit www.BMSStudyConnect.com Inclusion Criteria: - Diagnosis of JIA (any subtype) - Age < 18 years at the time of enrollment unless currently or previously enrolled in an abatacept clinical trial and received abatacept - Receiving Abatacept at the time of enrollment as per treating physician's decision or received abatacept in a clinical trial - Parent or legally acceptable representative willing to participate in the study and sign the informed consent Exclusion Criteria: - Pregnant or nursing female at the time of enrollment - Prior malignancies if the patient has not been malignancy free for at least 5 years. - Any serious acute or chronic medical condition other than JIA, including chronic infection, which would compromise the patient's ability to participate in the study - Known poor compliance with clinic visits (based on physician judgment)