Phage-host specificity tests were accomplished utilizing six serologically unrelated phages with 177 isolates of the genus and 44 A total of 84% of the levineae were infected by at least one of the phages, and 21 phage-host patterns were obtained. Only 9% of the isolates were infected. One phage, DM-21, only infected whereas the other phages showed no species specificity. Most of the infectivity patterns were specific for either , but some patterns showed no host specificity. A correlation was found between dulcitol fermentation and infectivity with DM-21. There was no evidence of a relationship between infectivity and source of isolation. The recommendation that the proposed genus be accepted rather than the inclusion of these organisms within the genus is discussed.


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