Molecular Epidemiologic Analysis of vanA-Containing Vancomycin-Resistant Enterococci / 대한진단검사의학회지
The Korean Journal of Laboratory Medicine
;
: 181-187, 2002.
Article
Dans Coréen
| WPRIM
| ID: wpr-182214
ABSTRACT
BACKGROUND:
Vancomycin-resistant enterococci (VRE) have been increasingly isolated world-wide as a nosocomial pathogen. To target infection control, epidemiologic investigations of VRE should include analysis of the resistance gene in addition to typing of strains. We performed molec-ular characterization of the vanA resistance gene to evaluate the inter or intraconstitutional spread.METHODS:
Twenty isolates of VanA VRE from the Centers for Disease Control and Prevention (CDC) and 17 from Ajou University Hospital (AUH) were investigated. Minimum inhibitory concen-trations of vancomycin, teicoplanin, and ampicillin were tested by the agar dilution method. Pulsed-field gel electrophoresis (PFGE) and long PCR-restriction fragment length polymorphism (long PCR-RFLP) were performed. The long PCR negative strains were typed by ORF1-, vanS-vanH-, vanX-, vanY-vanZ-, vanZ-, and IS1216-specific PCRs. Filter matings were performed by using rifampin-resistant, fusidic acid-resistant E. faecalis J H2-2 as the recipient.RESULTS:
The PFGE from the VRE of the CDC showed 15 patterns including 4 clusters and PFGE from isolates of AUH revealed 6 patterns including 3 clusters. Tn1546 amplicons were detected in 18 of 20 (90%) CDC strains and 16 of 17 (94%) AUH strains. RFLP of Tn1546 amplicons revealed 5 different patterns in the VRE of the CDC strains, and 2 patterns in the VRE of the AUH strains. The mean transfer efficiency of the CDC and the AUH strains are 3.0 X 10(-8)and 4.9 X 10(-5)transconju-gant/ donor, respectively.CONCLUSIONS:
Molecular typing of isolates from the CDC suggests the horizontal spread of vanA genes among genetically diverse strains. Analysis of the VRE from the AUH shows a mixed pattern with clonal dissemination of strains and horizontal transfer of vanA.
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Donneurs de tissus
/
Polymorphisme de restriction
/
Vancomycine
/
Réaction de polymérisation en chaîne
/
Prévention des infections
/
Électrophorèse en champ pulsé
/
Téicoplanine
/
Agar-agar
/
Typage moléculaire
/
Furosémide
Limites du sujet:
Humains
langue:
Coréen
Texte intégral:
The Korean Journal of Laboratory Medicine
Année:
2002
Type:
Article
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