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Characteristics of Listeria monocytogenes isolated from imported meat in Japan

Fukiko Ueda1, Kunitoshi Ogasawara, Ryo Hondo

  • 1Department of Veterinary Public Health, Nippon Veterinary and Animal Science University, Tokyo 180-8602, Japan. fueda@nvau.ac.jp

Japanese Journal of Infectious Diseases
|February 24, 2006
PubMed

Insights

Genomic analysis of Listeria monocytogenes serovar 4b revealed imported chicken strains share rare genetic traits with Japanese isolates. This suggests potential foreign origins for these specific bacterial strains.

Area of Science:

  • Microbiology
  • Genomics
  • Food Safety

Background:

  • Listeria monocytogenes is a significant foodborne pathogen.
  • Serovar 4b is a prevalent type of Listeria monocytogenes.
  • Imported foods can introduce novel or rare microbial strains into new environments.

Purpose of the Study:

  • To compare the genomic structure of the iap region in Listeria monocytogenes serovar 4b.
  • To investigate the origin of a Listeria monocytogenes isolate from imported chicken in Japan.

Main Methods:

  • Comparative genomic analysis of the iap region.
  • Isolation and characterization of Listeria monocytogenes from imported chicken.
  • Strain typing and genetic comparison with existing Japanese Listeria monocytogenes databases.

Main Results:

  • The Listeria monocytogenes isolate from imported chicken exhibited a genomic structure similar to a rare group of Japanese strains.
  • The iap region's genomic structure suggests a potential shared ancestry or recent introduction.
  • The findings highlight the genetic diversity within Listeria monocytogenes serovar 4b.

Conclusions:

  • The study suggests that rare Listeria monocytogenes serovar 4b strains found in Japan may be imported.
  • Genomic surveillance of food imports is crucial for monitoring the introduction of potentially novel bacterial strains.
  • Understanding the genomic epidemiology of Listeria monocytogenes aids in food safety risk assessment.

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