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A Flagellar Phage for the Proteus-providence Group

Department of Microbiology, University of Pretoria and Division of Life Sciences, Atomic Energy Board, Pretoria, South Africa

A phage which attacks many motile strains of the Proteus-providence group did not replicate on aflagellate or paralysed mutants. The phage consisted of an hexagonal head, a tail and one tail fibre and resembled x₁. Electron micrographs demonstrated adsorption of the phage to the flagellar shaft of the host and the presence of phage at the flagellar base. Some of the latter phage possessed empty heads, and we postulate that the phage injects its nucleic acid at the base. This phage and x₁ had a slight serological relationship.

Received 1 May 1971; accepted 9 June 1971.