A recent study published in The Lancet showed the efficacy and safety of two infant drug regimens (lamivudine or lopinavir–ritonavir) to prevent postnatal HIV-1 transmission up to 50 weeks of breastfeeding in Africa. This is the first study to show the success of ARV provision to prevent mother-to-child transmision beyond six months.
The authors report on randomised controlled trial in four sites in Burkina Faso, South Africa, Uganda, and Zambia in children born to HIV-1-infected mothers not eligible for antiretroviral therapy (CD4 count >350 cells per μL). The study enrolled and randomised 1273 infants and analysed 1236; 615 assigned to lopinavir–ritonavir or 621 assigned to lamivudine. There were 17 HIV-1 infections diagnosed in the study period (eight in the lopinavir–ritonavir group and nine in the lamivudine group), resulting in cumulative HIV-1 infection of 1·4% (95% CI 0·4–2·5) and 1·5% (0·7–2·5), respectively.
These data show that Infant HIV-1 prophylaxis with lopinavir–ritonavir was equal in effectiveness to lamivudine and “both drugs led to very low rates of HIV-1 postnatal transmission for up to 50 weeks of breastfeeding.” The importance of this study is that infant pre-exposure prophylaxis can be safely prolonged until the end of HIV-1 exposure, when many mothers are encouraged to exclusively breast-feed for up to the first year of life.
Nagot, N. et al. 2015. Extended pre-exposure prophylaxis with lopinavir–ritonavir versus lamivudine to prevent HIV-1 transmission through breastfeeding up to 50 weeks in infants in Africa (ANRS 12174): a randomised controlled trial. The Lancet.