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Updated: Aug 12, 2026

Nanomechanics of Drug-target Interactions and Antibacterial Resistance Detection
Published on: October 25, 2013
[Drug-resistant bacteria of current topics and their resistance mechanisms--VRE]
1Department of Mycrobiolog, Gumma University Faculty of Medicine.
Abstract:
VRE isolates have only been detected in eight patients from four hospitals in Japan since 1996(reports of the Ministry of Health and Welfare, Japan). In Japan, it has been shown that VRE are high frequently isolated from chickens imported from Thailand and France where avoparcin has been used in animal feed. Two types of acquired glycopeptide resistance have been reported in clinical isolates of VRE. The VanA type strain is defined as having a high-level resistance to vancomycin and teicoplanin. The vanA resistance genes are induced by both vancomycin and teicoplanin. VanB type strains are characterized as having various levels of vancomycin resistance and are susceptible to teicoplanin. The vanB resistance genes are induced by vancomycin only.
Insights
Vancomycin-resistant Enterococci (VRE) are rare in Japan, primarily found in imported chickens. Two main types, VanA and VanB, exhibit distinct resistance patterns to vancomycin and teicoplanin antibiotics.
Area of Science:
- Microbiology
- Infectious Diseases
- Antimicrobial Resistance
Context:
- Vancomycin-resistant Enterococci (VRE) have been infrequently detected in Japanese hospitals since 1996.
- VRE are frequently isolated from imported chickens, particularly those from regions using avoparcin in animal feed.
- Understanding VRE epidemiology in Japan is crucial due to potential public health implications.
Purpose:
- To describe the prevalence and characteristics of VRE in Japan.
- To differentiate between VanA and VanB types of glycopeptide resistance in VRE.
- To inform strategies for VRE surveillance and control.
Summary:
- VRE detection in Japanese patients has been limited to eight cases across four hospitals since 1996.
- A significant source of VRE in Japan appears to be imported chickens exposed to avoparcin.
- Two acquired glycopeptide resistance types, VanA and VanB, are identified, differing in resistance levels and induction triggers.
Impact:
- Highlights the potential role of imported food products in VRE transmission.
- Provides a basis for targeted surveillance of VRE in healthcare and agricultural settings.
- Contributes to the global understanding of VRE resistance mechanisms and spread.
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