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Novel non-motile phenotypes of Yersinia ruckeri suggest expansion of the current clonal complex theory
- Tinsley, J.W., Austin, D.A., Lyndon, A.R., Austin, B.
- Journal of fish diseases 2011 v.34 no.4 pp. 311-317
- Yersinia ruckeri, antigens, biotypes, clones, fish, lipopolysaccharides, phenotype
- The biochemical and cell surface characteristics of 63 non-motile isolates of Yersinia ruckeri from various sources were compared using the API 20E rapid identification system and conventional phenotypic methods. Eight individual phenotypic groups from a variety of fish species were observed from the data set. Non-motile isolates were not exclusively observed from serogroup O1; membership of biotype 2 was recorded for representatives from serogroups O2-O7. Variations in phenotypes highlights that new clonal groups are arising and that the current typing scheme requires expansion. Previously, it was hypothesized that disease was caused by a few virulent clones; data in this paper suggests that this assumption is not the case. The lipopolysaccharide (O antigen) type in the non-motile biotype was different from other isolates of Y. ruckeri.