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Journal of Clinical Microbiology, October 2001, p. 3609-3616, Vol. 39, No. 10
Department of Bacterial Diseases, Veterinary
Laboratories Agency-Weybridge, Addlestone, Surrey KT15
3NB,1 and Faculty of Science,
School of Life Science, Kingston University, Kingston on Thames KT1
2EE,2 United Kingdom
Received 21 March 2001/Returned for modification 1 July
2001/Accepted 23 July 2001
Salmonella enterica serotypes
Derby, Mbandaka, Montevideo, Livingstone, and Senftenberg were among
the 10 most prevalent serotypes isolated from farm animals in England
and Wales in 1999. These serotypes are of potential zoonotic relevance;
however, there is currently no "gold standard" fingerprinting
method for them. A collection of isolates representing the former
serotypes and serotype Gold Coast were analyzed using plasmid
profiling, pulsed-field gel electrophoresis (PFGE), and ribotyping. The
success of the molecular methods in identifying DNA polymorphisms was
different for each serotype. Plasmid profiling was particularly useful
for serotype Derby isolates, and it also provided a good level of discrimination for serotype Senftenberg. For most serotypes, we observed a number of nontypeable plasmid-free strains, which represents a limitation of this technique. Fingerprinting of genomic DNA by
ribotyping and PFGE produced a significant variation in results, depending on the serotype of the strain. Both
PstI/SphI ribotyping and
XbaI-PFGE provided a similar degree of strain
differentiation for serotype Derby and serotype Senftenberg, only
marginally lower than that achieved by plasmid profiling. Ribotyping
was less sensitive than PFGE when applied to serotype Mbandaka or
serotype Montevideo. Serotype Gold Coast isolates were found to be
nontypeable by XbaI-PFGE, and a significant proportion
of them were found to be plasmid free. A similar situation applies to a
number of serotype Livingstone isolates which were nontypeable by
plasmid profiling and/or PFGE. In summary, the serotype of the isolates
has a considerable influence in deciding the best typing strategy; a
single method cannot be relied upon for discriminating between strains,
and a combination of typing methods allows further discrimination.
0095-1137/01/$04.00+0 DOI: 10.1128/JCM.39.10.3609-3616.2001
Molecular Typing of Salmonella
Serotypes Prevalent in Animals in England: Assessment of
Methodology
*
Corresponding author. Mailing address: Veterinary
Laboratories Agency-Weybridge, Department of Bacterial Diseases,
Woodham Ln., Addlestone, KT15 3NB Surrey, England, United Kingdom.
Phone: 44 1932 357587. Fax: 44 1932 357595. E-mail:
E.liebana{at}VLA.DEFRA.gsi.gov.UK.
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