In order to investigate the relationship between human immunodeficienc
y virus (HIV-1) infection and protein-energy malnutrition (PEM), all 1
01 malnourished children who were admitted to the Department of Pediat
rics of the National University Hospital between February and July of
1989 (median age = 2.5 years), and who were accompanied by their mothe
r were screened for HIV-1 antibody. Mothers were also screened and int
erviewed. Mother-child pairs were followed-up 2 years later to determi
ne mortality and clinical status. Fourteen per cent of malnourished ch
ildren were HIV-1 seropositive. Only one seropositive child had a sero
negative mother. This child had a history of multiple blood transfusio
ns and injections. Among children above 15 months of age, HIV-1 seropo
sitivity was more common among marasmic children than among malnourish
ed children presenting with oedema at admission to the hospital. Also,
HIV-1 infection was found more frequently among chronically malnouris
hed children (low height for age and weight for age) than among acutel
y malnourished children (low weight for height). Mortality during the
2-year follow-up was 75 per cent among HIV-1 seropositive children and
23 per cent among HIV-1 seronegatives (mortality density ratio = 6.2;
95 per cent confidence interval = 2.2-17.4). Severe, chronic PEM shou
ld always alert health workers to the possible diagnosis of pediatric
AIDS, and its implications for treatment and prognosis.