TY - RPRT TI - X-linked hyper-IgM syndrome presenting as severe Pneumocystis pneumonia in a 6-month-old infant: a case report. AU - Ying Guo AU - Xiaoli He AU - Lijun Zhang AU - Mengting Li AU - Lulu He AU - Guoyan Lu PY - 2026 DO - 10.3389/fimmu.2026.1929323 UR - https://pubmed.ncbi.nlm.nih.gov/42718418/ ID - 42718418 ER -