Globally, more than 2000 children under 15 years of age are infected with HIV-1 every day. Some of these infections occur in utero, but the majority of children become infected at delivery and after birth through breast-feeding. While success of antiretroviral therapy dramatically decreased mother-to-child transmission in developed countries, antiretroviral drugs are not yet widely available and bottle-feeding is not an option in economically impoverished countries, where burden of HIV-1 infe...