ICYMI: Retrospective study of 98 patients with X-linked agammaglobulinemia (XLA) shows arthritis seen in 46% - more oligo- than polyarthritis, affecting . Knee, hip, and ankle. IVIG response rates around 70%; many w/ arthritis had missense mutation https://t.co/qT49OXLyKU https://t.co/Drz1poV1AH