title: Characterization of atypical Aeromonas salmonicida by different methods.
abstract: Fifty two isolates of atypical Aeromonas salmonicida, recovered from a wide range of hosts and geographical locations, were heterogeneous in terms of molecular and phenotypic characteristics, and represented taxa which could not be accommodated by the current classification of four subspecies. Generally, there was incongruence between the molecular (PCR, RAPD and ribotyping) and phenotypic methods in terms of cluster membership. By PCR, 6 groups were described of which Group 1 encompassed 12 isolates including the type strain of A. salmonicida subsp. smithia. Group 2 accommodated 23 isolates including the reference cultures of subspecies achromogenes and masoucida. The named culture of Haemophilus piscium was recovered in Group 6. By ribotyping and RAPD, the reference cultures were recovered in separate groups. All methods pointed to the uniqueness of subspecies smithia. Most isolates contained 2-6 plasmids, of 2.3 to 150 kb in length. Nevertheless, all isolates possessed certain key characteristics, including Gram-negativity, and the absence of motility.
authors.affiliation: Department of Biological Sciences, Heriot-Watt University, Edinburgh, Scotland. b.austin@hw.ac.uk
authors.forename: B
authors.initials: B
authors.lastname: Austin
authors.forename: D A
authors.initials: DA
authors.lastname: Austin
authors.forename: I
authors.initials: I
authors.lastname: Dalsgaard
authors.forename: B K
authors.initials: BK
authors.lastname: Gudmundsdóttir
authors.forename: S
authors.initials: S
authors.lastname: Høie
authors.forename: J M
authors.initials: JM
authors.lastname: Thornton
authors.forename: J L
authors.initials: JL
authors.lastname: Larsen
authors.forename: B
authors.initials: B
authors.lastname: O'Hici
authors.forename: R
authors.initials: R
authors.lastname: Powell
mesh_terms: D000333:Aeromonas / Q000145:classification* / Q000302:isolation & purification* / Q000472:pathogenicity; D000818:Animals; D015373:Bacterial Typing Techniques; D004269:DNA, Bacterial / Q000032:analysis; D004275:DNA, Ribosomal / Q000032:analysis; D005393:Fish Diseases / Q000382:microbiology; D005399:Fishes / Q000382:microbiology*; D016905:Gram-Negative Bacterial Infections / Q000382:microbiology / Q000662:veterinary; D016133:Polymerase Chain Reaction; D019105:Random Amplified Polymorphic DNA Technique; D012407:rRNA Operon
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal