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Updated: Jun 8, 2026
Isolation of Leukocytes from Human Breast Milk for Use in an Antibody-dependent Cellular Phagocytosis Assay of HIV Targets
Published on: September 6, 2019
Maternal HIV viral load threshold for guiding extended infant prophylaxis
Jean-Pierre Molès1, Morgana D'Ottavi1, David Rutagwera2
1Pathogenesis and Control of Chronic and Emerging Infections, Montpellier University, INSERM, CHU Montpellier, 34493 Montpellier France.
Objectives:
Infant postnatal prophylaxis (PNP) is universally recommended for all breastfed infants born from mothers living with HIV up to 6-weeks of age. Continuation of PNP was recommended for infants defined as at high-risk of HIV acquisition. We hypothesised that a single maternal viral load (mVL) at the end of the universal PNP period can accurately identify infants requiring extended prophylaxis.
Methods:
We assessed 1398 VL of breastfeeding mothers from Zambia and Burkina Faso at baseline (week 6-8), months 6 and 12 post-partum. Infants were defined at high-risk of HIV acquisition when mVL was ≥ 1000 cp/mL.
Results:
Mothers with a VL between 40 and 1000 cp/mL or ≥ 1000 cp/mL at baseline were 6 [95CI 3.7-9.6] or 18 [95CI 12.6-25.7] times more likely to have a VL above 1000 cp/mL during breastfeeding than mothers with a VL below 40 cp/mL. A 40 cp/mL threshold for mVL showed a better performance to identify infants eligible for extended PNP in comparison with the standard threshold.
Conclusion:
A single mother VL at W6-8 enabled a sensitive identification of infants at risk of HIV acquisition throughout the breastfeeding period. This conclusion may pave the way for a simplified risk-stratified guideline for the initiation of extended infant PNP.
