Summary: Using enrichment methods, a new bacteriophage (M1) was isolated, which is capable of generalized transduction in subsp. () strain SCRI1043. M1 is probably a virulent phage and contains double-stranded DNA of approximately 43 kb. Transduction frequencies for a number of chromosomal markers and plasmid pHCP2 were established, and conditions for transduction optimized. UV irradiation of the lysates prior to transduction enhanced the transduction frequency. M1 infected over 25% of strains tested and so may be useful both for the genetic analysis of a number of isolates and for the transductional transfer of selectable markers between strains.


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