[Characterization of R plasmids in "Salmonella typhi" and "S. paratyphi B" from Algeria (author's transl)].

The distribution of R plasmids in six drug-resistant Salmonella typhi strains and four S. paratyphi B strains isolated from human in Algeria was studied. All strains but one S. typhi harbored one conjugative R plasmid. Plasmids belonging to the incompatibility groups FIme, B, W or P were found in the S. typhi strains and those belonging to groups FIme or B were found in the S. paratyphi B strains. The epidemiological surveillance of R plasmids shows that the drug resistance of these strains is not the result of the epidemic spread of particular strains of Salmonella.