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HIV-1 LTR subtype and perinatal transmission.

J T Blackard1, B Renjifo, W Fawzi

  • 1Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, Massachusetts 02115, USA.

Virology
|September 5, 2001
PubMed
Summary
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HIV-1 subtype influences mother-to-infant transmission. Subtypes A, C, and recombinant HIV-1 strains show higher transmission rates than subtype D, impacting perinatal HIV-1 prevention strategies.

Area of Science:

  • Virology
  • Epidemiology
  • Public Health

Background:

  • Human Immunodeficiency Virus type 1 (HIV-1) exhibits diverse subtypes globally.
  • Limited data exists on the comparative transmissibility of different HIV-1 subtypes, particularly in mother-to-infant transmission.
  • Understanding subtype-specific transmission dynamics is crucial for effective prevention and control strategies.

Purpose of the Study:

  • To investigate the relative transmissibility of different HIV-1 long terminal repeat (LTR) subtypes during mother-to-infant transmission.
  • To determine if specific HIV-1 LTR subtypes are associated with increased or decreased perinatal transmission rates.

Main Methods:

  • A matched case-control study design was employed.
  • Long terminal repeat (LTR) subtypes were determined for 45 matched mother-infant pairs from a clinical trial in Tanzania.

Related Experiment Videos

  • Statistical analysis using exact matched logistic regression was performed to assess transmission probabilities.

    • Main Results:

    • HIV-1 subtypes A, C, and intersubtype recombinant sequences were identified.
    • Viruses with subtype A or intersubtype recombinant LTRs were 3.2 and 4.8 times more likely to be transmitted perinatally compared to subtype D.
    • Subtype C LTRs were associated with a 6.1-fold increased likelihood of mother-to-infant transmission versus subtype D.
    • These transmission differences were independent of maternal CD4 cell counts at enrollment.

    Conclusions:

    • HIV-1 subtype appears to be a significant factor influencing perinatal transmission rates in Tanzania.
    • Specific HIV-1 subtypes (A, C, and recombinants) demonstrate higher transmissibility than subtype D.
    • Findings highlight the need to consider HIV-1 subtype in the development of targeted interventions for preventing mother-to-infant transmission.