[The use of stains for the detection of the pathogenetic factors of Escherichia and Salmonella].

The authors have modified the technique for using three stains to detect enterobacterial pathogenicity factors. The methods have been tried with 306 Escherichia and Salmonella strains. The most accurate results were obtained when azure eosin was layered onto culture growth surface and when Congo red was added into solid medium. Crystal violet layering yielded less specific results. The techniques listed above helped detect pathogenicity factors of up to 25-30 percent of Escherichia and up to 17 percent of Salmonella strains. The methods are recommended to be used in complex with other tests in practical studies.