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Lett Appl Microbiol. 2005;41(2):157-62.

A vancomycin-dependent VanA-type Enterococcus faecalis strain isolated in Japan from chicken imported from China.

Author information

1
Laboratory of Bacterial Drug Resistance, Gunma University Graduate School of Medicine, Maebashi, Gunma, Japan.

Abstract

AIMS:

The characterization of KC122.1, which is a vancomycin-dependent VRE (Vancomycin-resistant enterococci) (Enterococcus faecalis) and the first case in Japan of a VRE isolate obtained from chicken meat imported from China.

METHODS AND RESULTS:

PCR amplification of vanA, vanS and ddl gene and direct sequencing of the PCR products were performed. KC122.1 was a VanA-type VRE showing high-level vancomycin resistance and low-level teicoplanin resistance, and its vanS gene had three point mutations. The ddl gene of KC122.1 was sequenced and two changes were found at the ninth codon (GCC-GAC) and the stop codon (TAA-CAA). The latter change was also found in the laboratory strain E. faecalis FA2-2.

CONCLUSIONS:

Three point mutations in vanS resulted in high-level vancomycin resistance and low-level teicoplanin resistance. The change at the ninth codon resulted in the inactivation of the ddl gene and vancomycin-dependent growth. An eight amino acid extension at the C-terminal did not impair the function of the D-Ala : D-Ala ligase.

SIGNIFICANCE AND IMPACT OF THE STUDY:

This is the first example of the isolation of VRE from chicken meat imported from China and the first vancomycin-dependent VRE from a nonhuman source.

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