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Prevalence and antimicrobial resistance of Listeria species and subtyping and virulence factors of Listeria monocytogenes from retail meat
Author(s) -
Arslan Seza,
Baytur Selin
Publication year - 2019
Publication title -
journal of food safety
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.427
H-Index - 43
eISSN - 1745-4565
pISSN - 0149-6085
DOI - 10.1111/jfs.12578
Subject(s) - listeria monocytogenes , listeria , microbiology and biotechnology , subtyping , biology , serotype , virulence , ampicillin , bacteria , antibiotics , gene , genetics , computer science , programming language
In this study, of 124 samples of ground beef and chicken meat, 101 (81.5%) were positive for Listeria spp. Listeria innocua (35.5%) and Listeria monocytogenes (26.6%) were the most frequently isolated species. All 33 (100%) L. monocytogenes isolates were positive for the virulence genes hlyA , actA , inlA, inlB, inlC, inlJ , prfA , plcA , and iap . Serotype 1/2a, which is one of the listeriosis‐associated serotypes, was the most predominant serotype (57.6%), followed by 1 / 2c (39.4%) and 3c (3%). In polymerase chain reaction‐restriction fragment length polymorphism (PCR‐RFLP) analysis of inlA for subtyping of the L. monocytogenes strains, the Alu I and Mlu CI enzymes generated two different profiles. Almost all chicken strains were grouped in similar PCR‐RFLP profiles with both restriction enzymes. Most Listeria isolates were resistant to ceftriaxone (79.7%), fusidic acid (63.3%), and clindamycin (47.7%). Resistance to penicillin and ampicillin occurred in 1.6 and 17.9% of the isolates, respectively. The percentage of resistance to three or more agents was 48.1%. Practical application The presence of Listeria spp., especially L. monocytogenes , in foods is inevitable because of the ubiquitous nature of Listeria spp. Illnesses resulting from the consumption of contaminated food severely affect sensitive groups, especially pregnant women, unborn fetuses and newborns as a result of transmission across the placenta or during delivery. Immunosuppressed adults are also sensitive to infection. Listeria grows well at cold temperatures, so storage of contaminated food in the refrigerator can also increase the risk of infections for consumers. In particular, limiting the exposure of pregnant women and immunosuppressed patients to potential sources of Listeria such as raw and undercooked meats is recommended.