[Increase of pathogenicity of Staphylococcus aureus strains caused by lysogenic conversion by phages of serologic group F].

The substantial influence of presence of the double converting prophages of the serological group F on the decrease of intensity of human leukocytes stimulation with lysogenic cells of S. aureus was determined. The end values of chemiluminescence in the six experimental systems containing lysogenic bacteria were only from 15.

[Bacteriophage conversion as a factor modifying the intensity of phagocytosis of Staphylococcus aureus by human leukocytes].

Staphylococcus aureus NCTC 8325-4 and its eight variants lysogenized with phages responsible for the synthesis of staphylococcal staphylokinase were used for the study. Influence of phage conversion of S. aureus on its interaction with human leucocytes and influence of prophage on strain susceptibility to intracellular killing by human granulocytes without opsonins were evaluated.