Recurrent respiratory tract infection due to isolated absence of IgA: report of a case.
D000293:Adolescent; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis*; D008297:Male; D012141:Respiratory Tract Infections / Q000276:immunology*; D005719:gamma-Globulins / Q000032:analysis
D007074:Immunoglobulin G; D005719:gamma-Globulins