Fluorescent amplified fragment length polymorphism and pulsed-field gel electrophoresis analyses of multidrug resistant salmonella enterica serotype typhi from different geographical endemic regions in Asia

Thong, Kwai Lin and Elgar, Sleman and Bhutta, Zulfikar and Yasin, Rohani and Schreiber, Edgar (2003) Fluorescent amplified fragment length polymorphism and pulsed-field gel electrophoresis analyses of multidrug resistant salmonella enterica serotype typhi from different geographical endemic regions in Asia. Asia Pacific Journal of Molecular Biology and Biotechnology, 11 (1). pp. 43-50. ISSN 0128-7451

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Abstract

Sixty-three isolates of Salmonella enterica serotype Typhi (S.typhi) from sporadic cases of typhoid fever obtained from Malaysia (n=6), Vietnam (n=13), India (n=8) and Pakistan (n=36) were characterized by phage typing, drug-susceptibility testing, amplified fragment length polymorphism (AFLP) and pulsed-field gel electrophoresis (PFGE) with restriction endonuclease, XbaI. The strains analyzed were mostly resistant to ampicillin, co-trimoxazole, tetracycline and chloramphenicol. These strains were represented by phage types, E1, E9, 46, J1, VNS and UVS. PFGE analysis showed that multidrug resistant (MDR) strains isolated in different countries and at different periods were genetically very homogenous where 90 of the strains analyzed had very closely related XbaI patterns. AFLP was able to subtype 42 clonally related MDR strains (represented by 8 PFGE patterns) into 16 profiles. Cluster analysis based on the AFLP and PFGE data using unweighted pair group mean averages could differentiate MDR strains from different geographical region and that the drug-sensitive strains were in a distinct cluster. The clustering of MDR strains from each country and the presence of a dominant XbaI-PFGE pattern indicated that the MDR S.typhi had probably been spread clonally in these countries. AFLP is clearly more discriminative than PFGE in differentiating the MDR S.typhi, hence providing an alternative, sensitive method for detailed analysis of the multidrug resistant strains.

Item Type: Article
Uncontrolled Keywords: AFLP; PFGE; S. typhi
Subjects: Q Science > Q Science (General)
Q Science > QH Natural history
Q Science > QR Microbiology
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: miss munirah saadom
Date Deposited: 12 Apr 2013 01:28
Last Modified: 15 Oct 2018 01:18
URI: http://eprints.um.edu.my/id/eprint/5520

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