CD34 and infection: Attempting to characterize the capacity of the MVM strains to interact with the human hematopoiesis at the organismal level, immunodeficient (NOD.Cg-PrkdcscidIl2rgtm1Wjl/ThomJ [NSG]) mice were transplanted with human cord-blood CD34+ cells to generate a xenogenic human hematopoiesis prior to intravenous infection with purified sterile-filtered MVMp and MVMi virions.