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Journal of Clinical Microbiology, July 2001, p. 2548-2557, Vol. 39, No. 7
Institut für Mikrobiologie und
Tierseuchen, Freie Universität, Berlin,1
and Zentrum für Agarlandschafts- und
Landnutzungsforschung (ZALF) e. V.,
Müncheberg,2 Germany
Received 5 September 2000/Returned for modification 20 January
2001/Accepted 8 April 2001
A serotyping scheme based on heat-stable surface antigens
was established for 101 Campylobacter upsaliensis and 10 Campylobacter helveticus strains isolated from 261 dogs
and 46 cats of different ages originating from two geographically
distinct regions in Germany. The prevalence of C.
upsaliensis varied between 27.8% in juvenile dogs (<12 months
of age) and 55.4% in adult dogs (P < 0.05). Of the cats, 19.6% harbored C. upsaliensis, whereas 21.7%
carried C. helveticus. Of the C.
upsaliensis isolates from both host species, 93.1% belonged to
five different serogroups, two of them being prevalent at rates of 47.5 and 27.7%, with different frequencies in both regions. Six (54.6%) of
the C. helveticus isolates also belonged to serotypes
found among C. upsaliensis strains, whereas five
(45.4%) possessed an O antigen unique for C.
helveticus. In contrast, a considerable degree of genomic
diversity of the isolates was assessed by macrorestriction analyses
with the endonucleases SmaI and XhoI,
using pulsed-field gel electrophoresis as well as enterobacterial
repetitive intergenic consensus sequence PCR (ERIC PCR). Restriction
with SmaI pointed towards the existence of clonal groups
associated to some extent with serotypes, while restriction with
XhoI disintegrated these groups to smaller noncoherent subgroups. Analysis of ERIC PCR profiles did not exhibit any
associations with serotypes. In conclusion these data demonstrate the
genomic heterogeneity among C. upsaliensis strains and
indicate that the combination of SmaI restriction with
serotyping is a useful tool to investigate the expansion of clonal
groups of C. upsaliensis.
0095-1137/01/$04.00+0 DOI: 10.1128/JCM.39.7.2548-2557.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Genomic Heterogeneity and O-Antigenic Diversity of
Campylobacter upsaliensis and Campylobacter
helveticus Strains Isolated from Dogs and Cats in
Germany
*
Corresponding author. Mailing address: Institut
für Mikrobiologie und Tierseuchen, Philippstrasse 13, 10115 Berlin, Germany. Phone: 0049 30 2093 6704. Fax: 0049 30 2093 6067. E-mail: IMoser{at}zedat.fu-berlin.de.
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