SUMMARY: A phage was isolated from sewage and shown to form plaques on strains carrying C plasmids. It failed to multiply on strains lacking plasmids of this group. It also plated on and strains carrying various IncC plasmids but failed to form plaques on strains harbouring most of these plasmids, although in all cases, phage multiplication on the strains was demonstrated. No phage increase occurred in any of the strains which lacked an IncC plasmid or contained plasmids of other incompatibility groups. The phage is small, hexagonal in outline, contains RNA, is resistant to chloroform and adsorbs to the shafts of pili coded for by IncC plasmids.


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