[Phage-plasmid interactions in bacteria]

A review is devoted to consideration of the basic types of interaction of moderate and virulent bacteriophages and extrachromosomal elements in bacterial cells. Various experimental data confirm diversity of such interactions as well as resistance of bacteria to productive phage infection. Role of plasmids in such processes as abortion infection, lysogenic state, reparation of phage DNA as well as the effect of plasmids on the basic stages of phage development in the cells are analyzed. Possible mechanisms for limiting development of phages as a result of plasmids' presence in bacterial cells are considered.