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PICO
Question: Among patients with juvenile idiopathic arthritis, is the MMR booster immunogenic and does it affect their disease activity?
Question type: Prognosis
Study design: Randomized, open-label clinical equivalence trial
Investigators from 5 Dutch medical centers conducted a randomized open-label clinical trial to evaluate the immunogenicity and safety of the measles-mumps-rubella (MMR) booster vaccination in children with juvenile idiopathic arthritis (JIA) who had previously received their primary MMR vaccination. The study was conducted in patients 4 to 9 years old to allow patients in the nonvaccinated arm to receive their MMR booster on the normal schedule (age 9–10 years in Netherlands).
Patients who were on a biologic treatment for JIA (ie, etanercept, anakinra) had this treatment held for 5 half-lives before receiving the booster, and for an additional 3 to 7 …
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