1887

Abstract

We evaluated 11 variable number tandem repeat (VNTR) markers for the epidemiological investigation of serovar Typhi ( Typhi) infection and compared the results to those obtained by PFGE. PFGE, using one or two restriction enzymes (I and I), was insufficient to differentiate between some isolates that were epidemiologically unlinked. Multilocus variable-number tandem repeat analysis (MLVA)-8, based on analysis of the eight most variable VNTRs, displayed a high level of discrimination when distinguishing between epidemiologically unlinked isolates that could not be discerned by PFGE with two enzymes. An MLVA-8 typing scheme could be implemented as a routine subtyping tool for the epidemiological investigation of Typhi infections. Because seven of the 11 VNTRs are highly variable, the VNTR markers may only be useful in determining genetic relationships among very closely related isolates in short-term epidemiological studies and not for discerning Typhi clones.

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2012-02-01
2019-10-15
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