Among children with juvenile idiopathic arthritis (JIA) who had undergone primary immunization, the use of a measles-mumps-rubella (MMR) booster compared with no booster did not result in worse JIA disease activity, according to a study in the June 19 issue of JAMA. "Juvenile idiopathic arthritis is the most common childhood rheumatic disease, with a prevalence between 16 and 150 per 100,000...
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