{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,12]],"date-time":"2026-09-12T16:51:30Z","timestamp":1789231890530,"version":"build-2803163510"},"reference-count":79,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2025,4,3]],"date-time":"2025-04-03T00:00:00Z","timestamp":1743638400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Italian Ministry of Health","award":["IZS PLV 02\/21 RC"],"award-info":[{"award-number":["IZS PLV 02\/21 RC"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Antibiotics"],"abstract":"<jats:p>Background: The spread of antibiotic resistance genes (ARGs) from the food chain is a significant public health concern. Dairy products from raw milk containing lactic acid bacteria (LAB) resistant to antimicrobials may serve as vectors for the transfer of resistance to commensal or potentially pathogenic bacteria in the human gut. Detecting ARGs in dairy products and milk is, therefore, crucial and could aid in the development of strategies to mitigate resistance dissemination through the food chain. Objectives: This study aimed to determine the presence of ARGs and assess the antibiotic susceptibility of LAB strains isolated from dairy products made from raw milk. Methods: Fifty-four LAB strains were isolated from 41 dairy samples and were tested for antimicrobial susceptibility using broth microdilution to determine Minimal Inhibitory Concentration (MIC). Moreover, the presence of resistance genes related to tetracyclines, beta-lactams, quinolones, and erythromycin was examined using six multiplex PCR assays. Results: Lactobacillus spp. and Leuconostoc spp. strains exhibited a high level of resistance to vancomycin (93\u2013100%). Low-level resistance (4.2\u201320%) was observed in Lactococcus spp. and Lactobacillus spp. strains against tetracycline. Additionally, Lactococcus spp. strains showed resistance to trimethoprim\/sulfamethoxazole, erythromycin, and clindamycin. Twenty-two out of 54 LAB strains (40.7%) carried at least one antibiotic resistance gene, and five of these were multidrug-resistant. Genes associated with acquired resistance to tetracycline were commonly detected, with tetK being the most frequent determinant. Conclusions: This study demonstrated that LABs in dairy products can act as reservoirs for ARGs, potentially contributing to the horizontal transfer of resistance within microbial communities in food and consumers. These findings highlight the need for the ongoing surveillance of antibiotic resistance in LAB and the implementation of control measures to minimize the dissemination of resistance through dairy products.<\/jats:p>","DOI":"10.3390\/antibiotics14040375","type":"journal-article","created":{"date-parts":[[2025,4,4]],"date-time":"2025-04-04T06:52:56Z","timestamp":1743749576000},"page":"375","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Antibiotic Resistance in Lactic Acid Bacteria from Dairy Products in Northern Italy"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2237-5538","authenticated-orcid":false,"given":"Irene","family":"Floris","sequence":"first","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d\u2019Aosta, Via Bologna 148, 10154 Torino, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1470-3941","authenticated-orcid":false,"given":"Roberta","family":"Battistini","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d\u2019Aosta, Via Bologna 148, 10154 Torino, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3808-7327","authenticated-orcid":false,"given":"Clara","family":"Tramuta","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d\u2019Aosta, Via Bologna 148, 10154 Torino, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4458-8294","authenticated-orcid":false,"given":"Aitor","family":"Garcia-Vozmediano","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d\u2019Aosta, Via Bologna 148, 10154 Torino, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Noemi","family":"Musolino","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d\u2019Aosta, Via Bologna 148, 10154 Torino, Italy"},{"name":"Azienda Sanitaria Locale di Asti, Via Conte Verde 125, 14100 Asti, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1483-2305","authenticated-orcid":false,"given":"Giulia","family":"Scardino","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d\u2019Aosta, Via Bologna 148, 10154 Torino, Italy"},{"name":"Azienda Sanitaria Locale Asl Novara, Viale Roma 7, 28100 Novara, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chiara","family":"Masotti","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d\u2019Aosta, Via Bologna 148, 10154 Torino, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Beatrice","family":"Brusa","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d\u2019Aosta, Via Bologna 148, 10154 Torino, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9027-1642","authenticated-orcid":false,"given":"Riccardo","family":"Orusa","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d\u2019Aosta, Via Bologna 148, 10154 Torino, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura","family":"Serracca","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d\u2019Aosta, Via Bologna 148, 10154 Torino, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6597-475X","authenticated-orcid":false,"given":"Elisabetta","family":"Razzuoli","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d\u2019Aosta, Via Bologna 148, 10154 Torino, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francesca","family":"Martucci","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d\u2019Aosta, Via Bologna 148, 10154 Torino, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniela Manila","family":"Bianchi","sequence":"additional","affiliation":[{"name":"Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d\u2019Aosta, Via Bologna 148, 10154 Torino, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,4,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"771510","DOI":"10.3389\/fcimb.2021.771510","article-title":"Antibiotic Resistance: One Health One World Outlook","volume":"11","author":"Aslam","year":"2021","journal-title":"Front. 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