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Applied and Environmental Microbiology, December 2000, p. 5273-5281, Vol. 66, No. 12
Department of Immunology, Microbiology and
Parasitology, Basque Country University, 01080 Vitoria-Gasteiz,1 and Laboratory of
Microbiology, Public Health Laboratory, Basque Government, 48010 Bilbao,3 Spain, and Danish
Veterinary Laboratory, Copenhagen V, Denmark2
Received 25 May 2000/Accepted 3 October 2000
Strains of Salmonella enterica (n = 212) of different serovars and phage types were used to establish a
library typing computerized system for serovar Enteritidis on the basis
of PCR fingerprinting, infrequent-restriction-site PCR (IRS-PCR), or
pulsed-field gel electrophoresis (PFGE). The rate of PCR fingerprinting
interassay and intercenter reproducibility was low and was only
increased when DNA samples were extracted at the same time and
amplified with the same reaction mixtures. Reproducibility of IRS-PCR
technique reached 100%, but discrimination was low (D = 0.52). The PFGE procedure showed an intercenter reproducibility value
of 93.3%. The high reproducibility of PFGE combined with the
previously determined high discrimination directed its use for library
typing. The use of PFGE with enzymes XbaI,
BlnI, and SpeI for library typing of serovar
Enteritidis was assessed with GelCompar 4.0 software. Three computer
libraries of PFGE DNA profiles were constructed, and their ability to
recognize new DNA profiles was analyzed. The results obtained pointed
out that the combination of PFGE with computerized analysis could be
suitable in long-term epidemiological comparison and surveillance of
Salmonella serovar Enteritidis, specially if the prevalence
of genetic events that could be responsible for changes in PFGE
profiles in this serovar was low.
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Suitability of PCR Fingerprinting,
Infrequent-Restriction-Site PCR, and Pulsed-Field Gel
Electrophoresis, Combined with Computerized Gel Analysis, in
Library Typing of Salmonella enterica Serovar
Enteritidis
*
Corresponding author. Mailing address: Department of
Immunology, Microbiology, and Parasitology, Basque Country
University, Apdo. 450, 01080 Vitoria-Gasteiz, Spain. Phone: 34 945 013912. Fax: 34 945 130756. E-mail:
oipgacaj{at}vc.ehu.es.
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