EGFP expression was slightly lower for all retargeted vectors when compared to the control in both cell lines, but it is important to note that there was still a relatively high level of EGFP expression, 1.3–1.4 fold lower than the control, for all modified vectors in both normal human fibroblasts at a multiplicity of infection (MOI) of 0.5, and cord blood CD34+ cells at a MOI of 10. The gene discussed is CD34; the disease is infection.