EN
It has been found that CC81 cells cocultivated with the FLK-BLV or FLS-BLV cells from numerous syncytia within 17 hrs. Similar phenomenon, but less intensive, was observed in the culture of CC81 cells after treatment with the fluid from the 4-day culture of FLK-BLV cells. The culture of CC81 cells infected with particles of BLV separated from the culture fluid by ultracentrifugation showed also a cytopathogenic effect. The cells treated with large doses of the virus showed a marked dystrophy and break-up whereas smaller concentration of BLV caused formation of comparatively rare syncytia.