Comparison of field inversion gel electrophoresis with contour-clamped homogeneous electric field electrophoresis as a typing method for Enterococcus faecium.
J Clin Microbiol
; 33(6): 1554-7, 1995 Jun.
Article
de En
| MEDLINE
| ID: mdl-7650185
ABSTRACT
Direct comparisons between contour-clamped homogeneous electric field (CHEF) electrophoresis and field inversion gel electrophoresis (FIGE) to determine the epidemiology of antibiotic-resistant enterococci have not been previously published. Fifty non-beta-lactamase-producing, ampicillin-resistant Enterococcus faecium isolates and 10 vancomycin-resistant E. faecium strains collected from multiple centers were analyzed in a blinded fashion by CHEF electrophoresis and FIGE after digestion with SmaI. Isolates were considered clonally related if there was a difference of three of fewer bands between electrophoretic patterns. Agreement between CHEF electrophoresis and FIGE was seen for 12 of 13 identified groups of ampicillin-resistant E. faecium and 7 of 7 groups of vancomycin-resistant E. faecium. The lone discordance was accounted for by a fourth band difference between two strains recognized near 350 kb by CHEF electrophoresis but not by FIGE, placing them into different clonal groups. Better band separation was noted in the 50- to 200-kb range for FIGE, while CHEF electrophoresis revealed better resolution over 250 kb more reliably, including detection of some bands not seen on FIGE. Molecular epidemiologic investigations of E. faecium by either technique should provide comparable results.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Techniques de typage bactérien
/
Enterococcus faecium
/
Électrophorèse en champ pulsé
Type d'étude:
Diagnostic_studies
/
Evaluation_studies
Limites:
Humans
Langue:
En
Journal:
J Clin Microbiol
Année:
1995
Type de document:
Article
Pays d'affiliation:
États-Unis d'Amérique