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Plasmid pRW002 carries genetic determinants for exfoliative toxin B and bacteriocin R1 synthesis. When a donor strain carrying plasmid pRW002 was mixed with a plasmidless recipient strain on a nitrocellulose membrane in accordance with the procedure used for staphylococcal conjugation, pRW002 was passed to the recipient by mixed-culture transduction. Transfer was inhibited by citrate and serotype B phage antisera but not by DNase I. Cell-to-cell contact was not required, and transfer frequencies increased more than 10-fold in the presence of small concentrations of mitomycin C. These results are consistent with pRW002 transfer in mixed cultures by transduction and not by conjugation or transformation. Immunodiffusion and DNA analyses after agarose gel electrophoresis demonstrated that transductants were exfoliative toxin B producers and housed pRW002. Since mixed-culture transfer has been reported to occur on skin, our results suggest that mixed-culture transduction might be a mechanism for the transfer of genetic determinants for pathogenicity in vivo.

Transfer of the plasmid for exfoliative toxin B synthesis in mixed cultures on nitrocellulose membranes