two infants with human immunodeficiency virus ( hiv ) infection , encephalopathy , intrathecal anti-hiv igg antibody production and ( in one case ) the presence of hiv antigen received monthly doses of intravenous gammaglobulin ( ivgg ) and daily antimicrobial prophylaxis starting at the ages of 6 and 9 months respectively .
C0019693
human immunodeficiency virus
C0021051
hiv