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. 1992 Oct;58(10):3316–3322. doi: 10.1128/aem.58.10.3316-3322.1992

Phenotypic, antigenic, and molecular characterization of Pasteurella piscicida strains isolated from fish.

B Magariños 1, J L Romalde 1, I Bandín 1, B Fouz 1, A E Toranzo 1
PMCID: PMC183097  PMID: 1444366

Abstract

We compared Pasteurella piscicida strains isolated from different fish species in several European countries with strains isolated in Japan and the United States. The taxonomic analysis revealed that, regardless of the geographic origin and source of isolation, all the strains exhibited the same biochemical and physiological characteristics. Serological assays with different rabbit antisera demonstrated a high level of antigenic similarity among strains, with cross-agglutination titers of 20,480 to 40,960. This serological homogeneity was supported by the lipopolysaccharide (LPS) and membrane protein profiles. All the P. piscicida strains had the same electrophoretic LPS pattern, showing O side chains with a ladder-like structure, and shared at least four major outer membrane proteins, of 20, 30, 42, and 53 kDa. Western blot (immunoblot) analysis with LPS and protein indicated that all the P. piscicida strains are immunologically related. In addition, the chromosomal DNA fingerprint patterns obtained for the European strains with the enzymes EcoRI and BamHI were practically identical to those of the Japanese and U.S. strains. Although some differences were found in the plasmid profiles of P. piscicida, a large number of strains possessed in common plasmid bands of 20 and 7 MDa. In addition, a plasmid of 50 MDa was present in the majority of the European strains. Restriction endonuclease analysis demonstrated the genetic homology of the plasmid bands shared by most of the European strains. All the P. piscicida strains had the same drug resistance patterns, indicating that a correlation between plasmid carriage and resistance to a specific antimicrobial agent cannot be established. The high levels of phenotypic, serological, and genetic homogeneity found among the P. piscicida strains should facilitate the development of DNA probes with diagnostic purposes as well as the design of effective vaccines.

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Selected References

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