Four outbreak strains of O139 from endemic areas of India and Bangladesh were found to carry lysogenic phage(s). All of these phage(s) produced turbid plaques characteristic of lysogeny on MAK 757 (El Tor, Ogawa) cells as well as on their VcA-1 lysogens but were unable to infect 154 (classical) cells, the universal host for all classical phages. Colonies in the turbid plaques were O139 lysogens and these developed an auxotrophic requirement, mainly for purines suggesting the integration of the prophage into the host chromosome. The immunity profile of the O139 phage(s) was similar to that of phage α but differed in the sensitivity of the phage lysogen of MAK 757 to subsequent infection by phage β.


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