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Journal of Clinical Microbiology, January 2001, p. 201-206, Vol. 39, No. 1
Molecular Biology Unit, Virus Reference
Division,1 and Laboratory of Enteric
Pathogens,2 Central Public Health
Laboratory, London NW9 5HT, United Kingdom
Received 17 July 2000/Returned for modification 1 October
2000/Accepted 28 October 2000
Fluorescent amplified-fragment length polymorphism (FAFLP)
analysis, a high-resolution PCR-based genome fingerprinting method, was
used to subtype Salmonella enterica serovar Enteritidis
phage type 4. This single phage type is responsible for the majority of
salmonellosis in Europe. Twenty strains isolated from nine outbreaks,
five isolates from sporadic cases of human infection, four strains of
poultry origin, and one laboratory-derived strain were comparatively
studied by pulsed-field gel electrophoresis (PFGE) and FAFLP analysis.
Following macrorestriction with XbaI, PFGE classified
73% of PT4 strains as a single type. FAFLP analysis was carried out
with the primer pair EcoRI+0 and MseI+C,
by simultaneously sampling 170 to 190 loci throughout the PT4 genome.
Twenty-three FAFLP profiles, with 1 to 61 amplified-fragment
differences, were found among the 30 strains. The index of
discriminatory power of FAFLP analysis was 0.98, compared to 0.47 for
PFGE. FAFLP analysis assigned genotypes to each PT4 outbreak, as well
as sporadic PT4 infections, a significant development for the
epidemiology and control of this zoonotic enteric pathogen.
0095-1137/01/$04.00+0 DOI: 10.1128/JCM.39.1.201-206.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Fluorescent Amplified-Fragment Length Polymorphism Subtyping
of the Salmonella enterica Serovar Enteritidis Phage
Type 4 Clone Complex
*
Corresponding author. Mailing address: Virus Reference
Division, Central Public Health Laboratory, 61 Colindale Ave., London NW9 5HT, United Kingdom. Phone: 0208 200 4400, ext 3090. Fax: 0208 200 1569. E-mail: sevenwoods{at}hotmail.com.
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