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Of 86 strains of Salmonella cholerae-suis isolated in the U.K., 83 possessed the O antigen 617 and three the O antigen 627. All the O 617 strains were latently infected with the same phage which was active on the O 627 strains; during lyso-genization this phage converted O 627 strains to O 617. None of 900 strains of Escherichia coli was latently infected with this phage; nor were they susceptible to it.Two O 627 strains converted to O 617 by lysogenization were significantly more virulent for chicks than were their O 627 parent strains; lysogenization of one of these O 627 strains by two different non-converting phages was not accompanied by an increase in virulence. One of the converted strains tested in mice was more virulent for these animals than was the O 627 strain from which it was derived.The O 617 organisms were found at higher concentrations in the blood and liver of chickens into which they had been injected intravenously than were organisms of the O 627 strain from which they were derived. No difference was detected between the survival rates of the two kinds of organisms in normal chicken serum.

The Effect on Virulence of Converting the O Antigen of Salmonella cholerae-suis from 627 to 617 by Phage