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Incidence and characterization of Listeria spp. from foods available in Korea.

Author(s) : CHOI Y. C., CHO S. Y., PARK B. K., et al.

Type of article: Article

Summary

A total of 410 domestic Korean food samples were analyzed for the presence of Listeria spp. by the conventional US Department of Agriculture protocol, and strains were identified by morphological, cultural and biochemical tests. Among the total 410 food samples, 46 samples (11.2%) were found to be contaminated with Listeria species. Among the 46 strains of Listeria spp. isolates, 8 strains (17.42%) for Listeria monocytogenes, 3 strains (6.5%) for Listeria seeligeri, 33 strains (71.7%) for Listeria innocua, and 2 strains (4.4%) for Listeria welshimeri were identified, respectively. Only beef, chicken, pork, frozen foods, and sausages were contaminated with L. monocytogenes; the other products were free of L. monocytogenes. Of 46 Listeria spp. isolates, L. innocua (71.7%) was the most predominantly isolated Listeria species. An in vitro virulence assay for Listeria spp. was performed. Results showed that only L. monocytogenes killed approximately 95 to 100% hybridoma cells after 6 h and the other Listeria species, such as L. innocua, L. seeligeri, and L. welshimeri strains had about 0 to 10% lethal effect on hybridoma cells. An antibiotic susceptibility test showed that Listeria spp. isolates were very susceptible to the antibiotics tested, except for nalidixic acid. Serotyping showed that 75% of L. monocytogenes isolates from beef, chicken, and frozen pizza belonged to serotype 1 and 25% from sausage were type 4.

Details

  • Original title: Incidence and characterization of Listeria spp. from foods available in Korea.
  • Record ID : 2001-2766
  • Languages: English
  • Source: Journal of Food Protection - vol. 64 - n. 4
  • Publication date: 2001/04
  • Document available for consultation in the library of the IIR headquarters only.

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