title: CD4/CD8 T-cell ratio predicts HIV infection in infants: the National Heart, Lung, and Blood Institute P2C2 Study.
abstract: BACKGROUND
  In resource-poor regions of the world, HIV virologic testing is not available.
  
  
  OBJECTIVE
  We sought to evaluate the diagnostic usefulness of the CD4/CD8 T-cell ratio in predicting HIV infection in infants.
  
  
  METHODS
  Data from the 3- and 9-month visits for non-breast-fed infants born to HIV-infected mothers enrolled (1990-1994) in the Pediatric Pulmonary and Cardiac Complications of Vertically Transmitted HIV Infection Study (mother-to-child transmission of HIV, 17%) were analyzed. Data from the 3-month visit for infants enrolled (1985-1996) in the Perinatal AIDS Collaborative Transmission Study (mother-to-child transmission of HIV, 18%) were used for validation.
  
  
  RESULTS
  At 3 months of age, data were available on 79 HIV-infected and 409 uninfected non-breast-fed infants in the Pediatric Pulmonary and Cardiac Complications of Vertically Transmitted HIV Infection Study. The area under the curve (AUC) of the receiver operating characteristic curve at 3 months was higher for the CD4/CD8 ratio compared with the CD4(+) T-cell count (AUC, 0.83 and 0.75; P = .03). The mean CD4/CD8 ratio at the 3-month visit was 1.7 for HIV-infected infants and 3.0 for uninfected infants. A CD4/CD8 ratio of 2.4 at 3 months of age was almost 2.5 times more likely to occur in an HIV-infected infant compared with an uninfected infant (test sensitivity, 81%; posttest probability of HIV, 33%). Model performance in the Centers for Disease Control and Prevention Perinatal AIDS Collaborative Transmission Study validation test (224 HIV-infected and 1015 uninfected 3-month-old infants) was equally good (AUC, 0.78 for CD4/CD8 ratio).
  
  
  CONCLUSIONS
  The CD4/CD8 T-cell ratio is a more sensitive predictor of HIV infection in infants than the CD4(+) T-cell count.
  
  
  CONCLUSIONS
  The CD4/CD8 T-cell ratio can be used with caution to predict HIV infection in children.
authors.affiliation: Department of Pediatrics, Section of Allergy and Immunology, Baylor College of Medicine, Houston, TX, USA. wtsheare@TexasChildrensHospital.org
authors.forename: William T
authors.initials: WT
authors.lastname: Shearer
authors.forename: Savita
authors.initials: S
authors.lastname: Pahwa
authors.forename: Jennifer S
authors.initials: JS
authors.lastname: Read
authors.forename: Jian
authors.initials: J
authors.lastname: Chen
authors.forename: Sameera R
authors.initials: SR
authors.lastname: Wijayawardana
authors.forename: Paul
authors.initials: P
authors.lastname: Palumbo
authors.forename: Elaine J
authors.initials: EJ
authors.lastname: Abrams
authors.forename: Stephen R
authors.initials: SR
authors.lastname: Nesheim
authors.forename: Wanrong
authors.initials: W
authors.lastname: Yin
authors.forename: Bruce
authors.initials: B
authors.lastname: Thompson
authors.forename: Kirk A
authors.initials: KA
authors.lastname: Easley
mesh_terms: D016516:CD4-CD8 Ratio; D015496:CD4-Positive T-Lymphocytes / Q000473:pathology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000473:pathology; D002675:Child, Preschool; D005260:Female; D015658:HIV Infections / Q000175:diagnosis / Q000276:immunology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D018445:Infectious Disease Transmission, Vertical; D054555:National Heart, Lung, and Blood Institute (U.S.); D011237:Predictive Value of Tests; D014481:United States