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Growth of Male-Specific Bacteriophage in Pasteurella Harboring F-Genotes Derived from Escherichia coli

When either the F′ lac or the F′Cm plasmid was transferred from Escherichia coli into Pasteurella pseudotuberculosis, the P. pseudotuberculosis (F′) strains isolated formed plaques with both ribonucleic acid (RNA)-containing and deoxyribonucleic acid-containing male-specific phages. In contrast, strains of P. pestis harboring E. coli (F′) plasmids did not form plaques with male-specific phages, although such strains permitted limited multiplication of phage MS2. The adsorption and burst size of MS2 were approximately the same in both species of Pasteurella, but the per cent of adsorbed MS2 that produced infective centers was much lower in P. pestis than it was in P. pseudotuberculosis. By use of a sib-selection technique of P. pestis (F′) cells, we isolated a single clone that could form MS2 plaques. 32P-labeled MS2 adsorbed equally to and its RNA penetrated equally into both the typical MS2-nonpermissive P. pestis cells and the MS2-permissive P. pestis cells. No host modification occurred after growth of MS2 in Pasteurella. Our data suggest that typical strains of P. pestis inhibit the intracellular development of phage MS2.