The isolation of three bacteriophages active on is reported. These phages only infected isolates; a variety of other Gramnegative bacteria were immune to infection with these phages. Each of these phages contained double-stranded DNA. Hyø1a had a polyhedral head and a short, non-contractile tail. Hyø22a was morphologically similar to Hyø1a. They appear to be genetically distinct however, as they could be distinguished from one another by their host ranges, their densities in CsCl, and the mol. wt. of their major protein components. Hyø32a had a polyhedral head and a long, flexible, non-contractile tail with fibres attached to its distal end. Each of these bacteriophages selectively adsorbed to daughter cells developing at the distal end of prosthecae on mother cells.


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