[Combined action of antibiotics and deoxyribonuclease on bacteria].

The impact of DNase on formation of biofilms by grampositive and gramnegative bacteria was studied. The enzyme was shown to inhibit the biofilm formation and have no toxicity to bacteria. When applied to the formed associations, DNase potentiated the effect of antibiotics on the bacteria located in them. An increase in the antimicrobial effect of various nonrelated antibiotics was not connected with a change in the bacteria susceptibility but likely resulted from a break of the genetic cooperation of the cells' community, connected with functions of extracellular DNA of the biofilm's matrix.