Abstract
A temperate bacteriophage was isolated from the colicinogenic strain of Escherichia coli K235 and characterized. This phage, termed PK, is related to P2 virus morphologically, serologically, and, possibly, genetically and it bears no relationship to the T-even phages. It was also demonstrated that PK virus and colicine K differ both in their host range and in their immunological specificity, and that PK prophage does not induce the colicinogenesis in its host bacterium. It was concluded that the formation of colicine K. and PK phage in E. coli K235 are controlled by different genetic determinants.
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