Origin and evolution of HIV-1 in breast milk determined by single-genome amplification and sequencing. by Salazar-Gonzalez, J, Salazar, MG, Learn, G, Fouda, G, Kang, H, Mahlokozera, T, Wilks, AB, Lovingood, R, Stacey, A, Kalilani, L, Meshnick, SR, Borrow, P, Montefiori, D, Denny, T, Letvin, N, Shaw, G, Hahn, B, Permar, SR