[Plasmid spectra and phagotypes of Escherichia coli strains isolated from patients with large intestine tumours].

The work deals with connection between plasmid spectra and phagotypes of Escherichia coli strains isolated from patients with tumours in large intestine. It has been established that 70 % of this bacterium isolates from the normal tissue, intestine lumen and tumours are characterized by multiple content of plasmids. Sometimes large endogenic plasmids are accompanied by the closed ring DNA with discrete sizes: 3.