Issue |
E3S Web Conf.
Volume 599, 2024
6th International Conference on Science and Technology Applications in Climate Change (STACLIM 2024)
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Article Number | 02002 | |
Number of page(s) | 7 | |
Section | Water and Food Security | |
DOI | https://doi.org/10.1051/e3sconf/202459902002 | |
Published online | 10 January 2025 |
Detection and characterization of Listeria monocytogenes contamination in raw vegetables
Faculty of Bioresources and Food Industry, Universiti Sultan Zainal Abidin, 22200 Besut, Terengganu, Malaysia
* Corresponding author: jyhtang@unisza.edu.my
Listeria monocytogenes is a psychrophilic bacterium that commonly contaminates and grows in food stored at refrigeration temperature. It can cause serious illness in the elderly, pregnant women, children and immunocompromised individuals. Thus, this study aimed to determine the prevalence of L. monocytogenes in eight selected salad vegetables and characterized antibiotic resistance profiles of L. monocytogenes isolates. A total of 154 salad samples were purchased from four different districts in Terengganu namely Besut, Jerteh, Kemaman and Kuala Terengganu. Samples were enriched with Listeria Enrichment Broth (LEB) at 30˚С for 24 hr before being subjected to selective medium PALCAM agar and PCR and LAMP assays. The L. monocytogenes isolates were tested against seven antibiotics using disk diffusion method. Percentage of L. monocytogenes in samples were detected at 5.19, 3.89 and 3.25% using PCR assay, LAMP assay and plating, respectively. L. monocytogenes isolates showed resistance towards tetracycline, vancomycin, penicillin G and erythromycin. Three isolates have multiple antibiotic resistance (MAR) index higher than 0.2 which indicate the contamination from high-risk or animal sources. It can be concluded that vegetable samples were contaminated with L. monocytogenes that exhibit antibiotic resistance. Consumption of raw vegetables will pose significant risk of foodborne infection.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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