title: [Phage-typing modifications induced by "in vitro" transfer of R plasmids. I.--Phage typing of Salmonella typhi (author's transl)].
abstract: The phage-typing modifications induced by transfer of antibiotic-resistance plasmids wre studied in two S. typhi Vi+ strains: n 2411 (phage-type A) and Ty2 (phage-type E1a). Forty-one R plasmids belonging to twenty-two incompatibility groups were investigated. Twenty-two plasmids were unable to produce any phage typing modifications. Among the groups of plasmids with phage-typing restriction capacity,four (I1, 10.B.O., N and W) groups were found heterogeneous with regard to this property and one (F1 group) caused significant modifications of the phage-types defined by the Vi phage-typing international system.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001434:Bacteriophage Typing; D003227:Conjugation, Genetic; D008242:Lysogeny; D011815:R Factors; D012485:Salmonella typhi / Q000145:classification* / Q000187:drug effects / Q000235:genetics
chemical_list: D000900:Anti-Bacterial Agents
vernacular_title: Etude des modifications du lysotype consécutives à l'acquisition in vitro de plasmides de résistance. I. --Lysotypie de Salmonella typhi.