{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T22:54:11Z","timestamp":1789167251942,"version":"build-2803163510"},"reference-count":34,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2023,4,6]],"date-time":"2023-04-06T00:00:00Z","timestamp":1680739200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Microbiol."],"abstract":"<jats:sec><jats:title>Introduction<\/jats:title><jats:p>Listeriosis, caused by infection with<jats:italic>Listeria monocytogenes<\/jats:italic>(<jats:italic>Lm<\/jats:italic>), is a relatively rare but severe disease with one of the highest mortality rates among bacterial foodborne illnesses. A better understanding on the degree of<jats:italic>Lm<\/jats:italic>clustering, the temporal distribution of the clusters, and their association with the various food sources is expected to lead to improved source tracing and risk-based sampling.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We investigated the genomic epidemiology of<jats:italic>Lm<\/jats:italic>in the Netherlands between 2010 and 2020 by analyzing whole-genome-sequencing (WGS) data of isolates from listerioss patients and food sources from nationwide integrated surveillance and monitoring. WGS data of 756 patient and 770 food\/environmental isolates was assessed using core-genome multi-locus sequence typing (cgMLST) with Hamming distance as measure for pairwise distances. Associations of genotype with the epidemiological variables such as patient\u2019s age and gender, and systematic use of specific drugs were tested by multinomial logistic regressions. Genetic differentiation of the<jats:italic>Lm<\/jats:italic>within and between food categories was calculated based on allele frequencies at the 1701 cgMLST loci in each food category.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>We confirmed previous results that some clonal complexes (CCs) are overrepresented among clinical isolates but could not identify any epidemiological risk factors. The main findings of this study include the observation of a very weak attribution of<jats:italic>Lm<\/jats:italic>types to food categories and a much better attribution to the producer level. In addition, we identified a high degree of temporal persistence of food, patient and mixed clusters, with more than half of the clusters spanning over more than 1 year and up to 10\u2009 years.<\/jats:p><\/jats:sec><jats:sec><jats:title>Discussion<\/jats:title><jats:p>Taken together this would indicate that identifying persistent contamination in food production settings, and producers that process a wide variety of raw food produce, could significantly contribute to lowering the<jats:italic>Lm<\/jats:italic>disease burden.<\/jats:p><\/jats:sec>","DOI":"10.3389\/fmicb.2023.1147137","type":"journal-article","created":{"date-parts":[[2023,4,6]],"date-time":"2023-04-06T05:23:01Z","timestamp":1680758581000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":16,"title":["New insights into the epidemiology of Listeria monocytogenes \u2013 A cross-sectoral retrospective genomic analysis in the Netherlands (2010\u20132020)"],"prefix":"10.3389","volume":"14","author":[{"given":"Claudia E.","family":"Coipan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ingrid H. 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