[Transfectable strains of Salmonella]

It the Ca2+-dependent system of an intact bacterial recipient the efficacy of DNA transfection of P22 H5 bacteriophage was determined in 48 strains of bacteria belonging to the Salmonella genus and in 5 Escherichia coli strains with known genetic characteristics and phenotypical properties. The sensitivity of the salmonella strains under study to R- and RS-specific bacteriophages, and also their capacity to ferment galactose were determined. Transfectable mutants of bacteria belongin to the Salmonella genus were referred to the Ra-type. The salmonella P22 H5 bacteriophage of the heterologous E. coli recipient isolated DNA transfection was demonstrated.