[Phage-typing modifications induced by in vitro transfer of R plasmids. II. -- Phage-typing of Shigella sonnei (author's transl)].

Forty-two antibiotic resistance plasmids and twelve metabolic plasmids have been transferred to a strain of Shigella sonnei. The phage-typing modifications have been investigated after transfer of the different above described plasmids. Eleven of the R plasmids and five of the metabolic plasmids affect phage sensitivity. These modifications are not specific for any compatibility group.