Methods for providing allogeneic, immune-tolerant and virus-resistant umbilical cord blood cells are provided. Compositions and methods for treating a disease or condition in a subject by transplantation of allogeneic, immune-tolerant, and virus-resistant umbilical cord blood cells are provided. PCR-based methods for identifying donor cord blood having a CCR5 Δ；32 genotype conferring HIV-resistance are provided.
