Multilocus variable-number tandem-repeat analysis for investigation of Clostridium difficile transmission in Hospitals.

Abstract:

:Clostridium difficile is a major cause of antibiotic-associated gastrointestinal illness. Recently, an increased incidence of hospital-acquired infections with severe outcomes has been reported in North America and Europe. Current molecular-typing methods for detection of outbreaks and nosocomial transmission are labor-intensive, subjective, or insufficiently discriminatory to differentiate between closely related strains. This report describes the development of multilocus variable-number tandem-repeat (VNTR) analysis (MLVA) for molecular subtyping of C. difficile. Seven VNTR loci were identified from the C. difficile 630 genome by screening an isolate collection of various restriction endonuclease analysis (REA) types. The stability of the loci for short-term epidemiologic investigations was determined by performing MLVA on consecutive isolates of the same REA type from individual patients collected over as many as 90 days. Validation of MLVA for molecular genotyping was performed by direct comparison with REA results obtained from Hines Veterans Affairs Hospital on a combined collection of 40 C. difficile isolates from two different sources. The ability of MLVA to detect outbreaks was demonstrated on a collection of tertiary-care hospital isolates from a defined C. difficile outbreak in 2001. MLVA successfully clustered C. difficile isolates of the same REA type and discriminated isolates of unique REA type. Thus, MLVA is an objective, portable genotyping method that permits reliable detection of C. difficile outbreaks and can aid epidemiologic investigations of nosocomial transmission.

journal_name

J Clin Microbiol

authors

Marsh JW,O'Leary MM,Shutt KA,Pasculle AW,Johnson S,Gerding DN,Muto CA,Harrison LH

doi

10.1128/JCM.02364-05

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

2558-66

issue

7

eissn

0095-1137

issn

1098-660X

pii

44/7/2558

journal_volume

44

pub_type

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