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Vertical transmission of HIV in New York State: a basis for statewide testing of newborns

T T Charbonneau1, N A Wade, L Weiner

  • 1Laboratory of Viral Diseases, Wadsworth Center, New York State Department of Health, USA.

AIDS Patient Care and Stds
|August 1, 1997
PubMed

Insights

Early diagnosis of HIV infection in infants is possible with Polymerase Chain Reaction (PCR) testing. This method reliably identifies infected infants within the first 8 weeks of life.

Area of Science:

  • Pediatric Infectious Diseases
  • Virology
  • Immunology

Background:

  • Vertical transmission of Human Immunodeficiency Virus (HIV) remains a significant concern in pediatric health.
  • Early identification of HIV infection in neonates is crucial for timely intervention and improved outcomes.
  • Existing diagnostic methods have limitations in sensitivity or age appropriateness for early infant diagnosis.

Purpose of the Study:

  • To evaluate the efficacy of Polymerase Chain Reaction (PCR) for early diagnosis of HIV infection in infants born to infected mothers.
  • To compare the performance of PCR with other diagnostic methods like Immune Complex Dissociation (ICD) antigen testing and p24 antigen testing.
  • To identify factors influencing vertical HIV transmission rates and explore surrogate markers of infection.

Main Methods:

  • A prospective study enrolled 313 infants of HIV-infected mothers.
  • HIV infection status was determined using laboratory and clinical evidence.
  • Polymerase Chain Reaction (PCR), Immune Complex Dissociation (ICD) antigen testing, and p24 antigen testing were employed.
  • Surrogate markers including soluble CD8, immunoglobulin levels, and CD4 T lymphocyte counts were analyzed.

Main Results:

  • Of 313 infants, 56 (17.9%) were diagnosed with HIV infection.
  • PCR testing demonstrated high sensitivity, with 97% positivity by 4 weeks of age and 100% by 8 weeks.
  • ICD testing was sensitive only in infants older than 1 month; p24 antigen testing was less sensitive.
  • Elevated soluble CD8 levels preceded other immunological changes.
  • Lower transmission rates were observed in Central and Western New York State.
  • Higher transmission rates were associated with low birth weight and maternal CD4 counts < 500.

Conclusions:

  • Polymerase Chain Reaction (PCR) is a reliable and sensitive method for the early diagnosis of HIV infection in neonates.
  • Establishing a Pediatric HIV PCR Testing Service is recommended for timely diagnosis and management.
  • Maternal health status (CD4 count) and infant birth weight are critical factors influencing vertical HIV transmission.

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