1887

Abstract

Summary: Fifty-six toxigenic mitis and mitis-like strains isolated in the western part of the United States and Canada were examined for lysogeny and for the relationship of their phages to conversion to toxigenicity. Twenty-five strains (46 %) were demonstrably lysogenic. Twenty-two of the phages from the toxigenic strains were able to convert a sensitive non-toxigenic strain to toxigenicity. Due to technical limitations three phages could not be tested in a similar manner. On the basis of serological relationships, cross-immunizing ability and host range all 22 converting phages proved to be very closely related. They were also related to - and -phages previously studied in connexion with the phenomenon of conversion to toxigenicity by bacteriophage.

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/content/journal/micro/10.1099/00221287-19-3-634
1958-12-01
2022-08-13
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