2Li M,Salazar-Gonzalez JF,Derdeyn CA,et al.Genetic and neutralization properties of subtype C human immunodeficiency virus type 1 molecular env clones from acute and early heterosexually acquired infections in Southern Africa.J Virol,2006,80:11776-11790.
3Platt E J,Wehrly K,Kuhmann SE,et al.Effects of CCR5 and CD4 cell surface concentrations on infections by macrophagetropic isolates of human immunodeficiency virus type 1.J Virol,1998,72:2855-2864.