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1 Department of Medical Microbiology, University of Aberdeen, Medical School Buildings, Foresterhill, Aberdeen AB25 2ZD, UK
2 Danish Veterinary Laboratory, Bülowsvej 27, DK-1790 Copenhagen V, Denmark
Author for correspondence: Clare S. Harrington. Tel: +45 35 30 02 83. Fax: +45 35 30 01 20. e-mail: csh{at}svs.dk
ABSTRACT
Phylogenetic relationships of Campylobacter hyointestinalis subspecies were examined by means of 16S rRNA gene sequencing. Sequence similarities among C. hyointestinalis subsp. lawsonii strains exceeded 99·0%, but values among C. hyointestinalis subsp. hyointestinalis strains ranged from 96·4 to 100%. Sequence similarites between strains representing the two different subspecies ranged from 95·7 to 99·0%. An intervening sequence was identified in certain of the C. hyointestinalis subsp. lawsonii strains. C. hyointestinalis strains occupied two distinct branches in a phylogenetic analysis of the genus Campylobacter, emphasizing the need for multiple strain analysis when using 16S rRNA gene sequence comparisons for taxonomic investigations.
Key Words: Campylobacter hyointestinalis • 16S rRNA • sequence diversity • phylogeny, taxonomy
The GenBank accession numbers for the 16S rRNA gene sequences determined in this paper are AF097681-AF097691.
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