Journal
LWT-FOOD SCIENCE AND TECHNOLOGY
Volume 64, Issue 2, Pages 905-910Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.lwt.2015.06.015
Keywords
Listeria monocytogenes; Chilled pork; Contamination; Antibiotic resistance
Categories
Funding
- National Natural Science Foundation of China [31071614]
- National Twelfth Five-Year Plan for Science and Technology of China [2012BAD28B02-03]
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The objective of this study was to investigate the prevalence of Listeria monocytogenes isolated from chilled pork from open-air markets and supermarkets in Nanjing and to characterize the isolates by serotyping, antibiotic resistance, and MLST subtyping analyses. The results showed that 26 of 476 samples (5.5%) were positive for L. monocytogenes. All the isolates belonged to three serotypes, with serotype 1/2a being dominant (53.8%), followed by serotype 1/2b (23.1%) and serotype 1/2c (23.1%). The antimicrobial susceptibility tests revealed that 5 isolates (19.2%) were susceptible to all antimicrobials used; the remaining strains were resistant to 1 (19.2%), 2 (34.6%), 3 (11.5%), 6 (3.85%) or even 9 (3.85%) different antimicrobials. All the isolates were susceptible to penicillin and vancomycin. Most of the isolates were susceptible to rifampicin and gentamicin (96.2%), cefotaxime (92.3%), streptomycin (92.3%) and trimethoprim/sulfamethoxazole (92.3%). MLST subtyping analyses revealed that 26 isolates were grouped into 10 sequence types (STs). Therefore, this study indicates the high percentage of serotypes 1/2a and 4b, which are associated with human listeriosis; and the high level of multi-resistance could be a public health hazard. (C) 2015 Elsevier Ltd. All rights reserved.
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