Shipman, Charles Jr. (Indiana University School of Medicine, Indianapolis), and Alvin S. Levine. Selective response of the Japanese quail to various strains of Rous sarcoma virus. J. Bacteriol. 92:161-163. 1966.-The Bryan "high-titer," Carr-Zilber, Harris, Prague, Schmidt-Ruppin, and "29" strains of Rous sarcoma virus were used to initiate tumors in the Japanese quail (Coturnix coturnix japonica). Although all strains produced tumors upon primary inoculation, only the Bryan "high-titer" and Harris strains could be serially passaged with cell-free tumor extracts. Analysis by means of the end-point dilution technique and the interference test revealed that the tumor extract of the Bryan "high-titer" strain passaged 10 times in the quail contained a Rous-associated virus.