Immunity deficiency in children.
D000361:Agammaglobulinemia / Q000235:genetics; D006087:Graft vs Host Reaction; D006801:Humans; D007153:Immunologic Deficiency Syndromes; D007223:Infant; D008221:Lymphoid Tissue / Q000002:abnormalities; D008297:Male; D012730:Sex Chromosomes; D013950:Thymus Gland / Q000002:abnormalities