title: Classification system for human immunodeficiency virus (HIV) infection in children under 13 years of age.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000145:classification* / Q000151:congenital / Q000635:transmission; D002487:Centers for Disease Control and Prevention, U.S.; D002648:Child; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D009369:Neoplasms / Q000209:etiology; D009422:Nervous System Diseases / Q000209:etiology; D009894:Opportunistic Infections / Q000209:etiology; D011658:Pulmonary Fibrosis / Q000209:etiology; D014481:United States