Avian Reticuloendotheliosis virus strain A and spleen necrosis virus do not infect human cells

Spleen necrosis virus (SNV) and Reticuloendotheliosis virus strain A (REV-A ) belong to the family of reticuloendotheliosis viruses and are 90% sequenc e related. SNV-derived retroviral vectors produced by the REV-A-based D17.2 G packaging cell line were shown to infect human cells (H.-M. Koo, A. M. C. Brown, Y. Ron, and J. P. Dougherty, J,Virol, 65:4769-4776, 1991), while si milar vectors produced by another SNV-based packaging cell line, DSH134G, a re not infectious in human cells (reviewed by R. Dornburg, Gene Ther. 2:301 -310, 1995). sere we describe a careful reevaluation of the infectivity of vectors produced from the most commonly used REV-A- or SNV-based packaging cells obtained from various sources with, among them, one batch of D17.2G p ackaging cells obtained from the American Type Culture Collection. None of these packaging cells produced vectors able to infect human cells. Thus, co ntrary to previously published data, we conclude that REV-based vectors are not infectious in human cells.