Abstract
Twenty strains each of Escherichia coli O26:B6 and O111:B4 were tested for lysogeny. Of these, 30% of the former were lysogenic but none of the latter showed this characteristic when tested by the same criteria. Colicin-like activity was initially mistaken for phage activity when O26:B6 phage preparations were tested on O111:B4 strains. The activity of the O26:B6 phages appeared to be restricted to this particular somatic group. High titers of phage could not be obtained by orthodox methods.

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