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[Distribution and characteristics of the R factors in E. coli isolated from poultry].

It has been demonstrated that Escherichia coli organisms isolated from birds in the district of Haskovo are up to 65 per cent resistant to drugs. It has been experimentally shown that the genetic determinants of resistance to chemotherapeutics are transferred via conjugation. The possibility of transferring R-factors from Escherichia coli to Salmonella typhimurium points to one of the routes for the occurrence of drug resistance in Salmonella bacteria.