Development and evaluation of a multiple-locus variable-number tandem-repeats analysis assay for subtyping Salmonella Typhi strains from sub-Saharan Africa
| Autor: | Anthony M. Smith, John Wain, Kalpy Julien Coulibaly, Germs-Sa, Karen H. Keddy, Nomsa P. Tau, Andrew Tarupiwa |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Microbiology (medical) Serotype 030231 tropical medicine 030106 microbiology Minisatellite Repeats Multiple Loci VNTR Analysis Biology Salmonella typhi Sensitivity and Specificity Microbiology 03 medical and health sciences 0302 clinical medicine Humans Typhoid Fever Africa South of the Sahara Molecular Epidemiology Molecular epidemiology Outbreak General Medicine bacterial infections and mycoses biology.organism_classification Virology Subtyping Molecular Typing Variable number tandem repeat Salmonella enterica |
| Zdroj: | Journal of Medical Microbiology. 66:937-945 |
| ISSN: | 1473-5644 0022-2615 |
| Popis: | Purpose. Molecular epidemiological investigations of the highly clonal Salmonella enterica subspecies enterica serovar Typhi (S. Typhi) are important in outbreak detection and in tracking disease transmission. In this study, we developed and evaluated a multiple-locus variable-number tandem-repeats (VNTR) analysis (MLVA) assay for characterization of S. Typhi isolates from sub-Saharan Africa. Methodology. Twelve previously reported VNTR loci were evaluated and an MLVA assay consisting of five polymorphic loci was adopted. The MLVA assay was developed for use on capillary electrophoresis systems by testing a collection of 50 S. Typhi isolates. This S. Typhi strain panel consisted of six outbreak related isolates and 44 epidemiologically unlinked isolates. Amongst these were nine S.Typhi haplotype H58 isolates. Results. The MLVA assay characterized the 50 isolates into 47 MLVA profiles while PFGE analysis of the same isolates revealed 34 pulsotypes. MLVA displayed higher discriminatory power (Simpson’s index of diversity (DI) 0.998 [95 % confidence interval (CI) 0.995–1.000)] as compared to pulsed-field gel electrophoresis [Simpson’s DI 0.984 (95 % CI 0.974–0.994)]. Conclusion. The MLVA assay presented in this study is a simple, rapid and more accessible tool that serves as a good alternative to other molecular subtyping methods for S. Typhi. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|