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Kondo, Eiko (Gunma University, Maebashi, Japan),and Susumu Mitsuhashi . Drug resistance of enteric bacteria. VI. Introduction of bacteriophage P1CM intoSalmonella typhi and formation of P1dCM and F-CM elements. J. Bacteriol.91: 1787–1794. 1966.—Bacteriophage P1CM was introduced intoSalmonella typhi by means of both phage infection and conjugation withEscherichia coli F+ lysogenic for the phage. Upon incubation with a P1CM phage lysate,S. typhi andS. abony yieldCM r cells which are lysogenic for P1CM , butS. typhimurium LT2 does not. The P1CM phage is adsorbed slightly toS. typhi , but no infectious centers are formed when the phage is plated on this strain. Tests on P1CM -adsorbing capacity of theS. typhi P1CM + strain and on plaque formation and transduction ability of the recovered phage from this strain indicated that the cell and the phage population did not have any special advantage over the original cell and phage population. Conjugation ofS. typhi withE. coli F+ carrying P1CM + gave three types ofS. typhi CM r clones: those which carry the whole P1CM phage, those with the P1dCM element, and those with nontransferableCM r . The second type has the F factor and is sensitive to f phages in spite of its typical behavior, serologically and biochemically, asS. typhi . It can donate the P1dCM and F+ characters toE. coli F− or F− /P1 strains. As a consequence of conjugation with theE. coli F+ strain, theCM r character of the third type ofS. typhi , the nontransferableCM r element, acquired conjugational transferability, owing to the formation of the element, F-CM . This element can be transferred to anE. coli F− strain at a very high frequency (ca. 100 ). Both the F andCM r determinants are jointly transduced with P1 phage and are jointly eliminated by acridine dye treatment.

journal of bacteriology

Drug Resistance of Enteric Bacteria VI. Introduction of Bacteriophage P1 CM into Salmonella typhi and Formation of P1 dCM and F- CM Elements