[Occurrence of R plasmids belonging to incompatibility group incC in Aeromonas hydrophila strains isolated from sewage water (author's transl)]. / Présence de plasmides de résistance appartenant au groupe d'incompatibilité C chez Aeromonas hydrophila isole d'eaux résiduaires.

The susceptibility to antimicrobial agents of 321 strains of Aeromonas hydrophila was studied: 319 strains were found to be resistant to one or several antibiotics. Transfer of resistance markers was obtained from 24 strains. Five plasmids from these strains were classified into incompatibility group incC. Epidemiological consequences of R plasmid diffusion in water bacteria are discussed.

[Instability of group FII plasmids in "Salmonella panama" (author's transl)]. / Instabilité des plasmides de type FII chez Salmonella panama

Almost all Salmonella panama isolated in France only harbour R plasmids of incompatibility groups I1 (K Col Ib) and N (T). Reference R plasmids belonging to 11 incompatibility groups have been introduced into S. panama. All are stable after 50 generations except those of group FII. FII instability cannot be explained either by the presence of a group FII cryptic plasmid or by restriction enzymes in S. panama.