Phage Typing and Lysotype Distribution ofXanthomonas campestris

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Abstract
Eleven phages of X. campestris [a plant pathogen] were tested and found to be species specific. An assembled group of 145 X. campestris strains was stop-tested against the phages at titers of 100 times routine-test-dilution. Based on differences in lytic patterns, a phage-typing scheme was proposed that utilizes 5 phages for differentiation of the bacteria into 2 major lysotypes designated A and B. Subtypes were distinguished by their differential lytic responses to the typing phages used to identify the major lysotypes. A group of 26 bacterial strains could not be typed because they were resistant to the phages. The geographical distribution of lysotypes based on bacterial origins was presented.