title: Morphology of Pasteurella multocida bacteriophages.
abstract: Twenty-one tailed phages with icosahedral heads belong to the Myoviridae, Siphoviridae, and Podoviridae families and to four morphological types. Type AU, with 10 phages, has a contractile tail and is morphologically identical with coliphage P2. Lysates contain contracted tail sheaths assembled end-to-end and abnormal structures with long tails and multiple tail sheaths. Types C-2 and 32, with one and three phages, respectively, have long, noncontractile tails. Type 22 includes seven phages, has a short tail, and resembles coliphage T7. Our results agree with previous biological data and suggest that types AU, C-2, 32, and 22 correspond to four different phage species.
mesh_terms: D001435:Bacteriophages / Q000145:classification / Q000648:ultrastructure*; D008854:Microscopy, Electron; D010325:Pasteurella / Q000648:ultrastructure*; D012703:Serotyping; D013045:Species Specificity