{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,21]],"date-time":"2026-10-21T21:11:29Z","timestamp":1792617089772,"version":"4.5.0"},"reference-count":80,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2025,1,9]],"date-time":"2025-01-09T00:00:00Z","timestamp":1736380800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Antibiotics"],"abstract":"<jats:p>Background: Thermophilic Campylobacter species are among the main culprits behind bacterial gastroenteritis globally and have grown progressively resistant to clinically important antimicrobials. Many studies have been carried out to explore innovative and alternative strategies to control antibiotic-resistant campylobacters in animal reservoirs and human hosts; however, limited studies have been performed to develop efficient control schemes against Campylobacter biofilms. Methods: This study investigated the antimicrobial and antibiofilm activities of some herbal extracts against multidrug-resistant (MDR) Campylobacter species recovered from different sources using phenotypic and molecular techniques. Results: The overall Campylobacter species prevalence was 21.5%, representing 15.25% and 6.25% for C. jejuni and C. coli, respectively. Regarding C. jejuni, the highest resistance rate was observed for amoxicillin\u2013clavulanic acid and colistin (85.25% each), followed by cefotaxime (83.61%) and tetracycline (81.97%), whereas C. coli isolates showed absolute resistance to cefotaxime followed by erythromycin (92%) and colistin (88%). Remarkably, all Campylobacter isolates were MDR with elevated multiple antimicrobial resistance (MAR) indices (0.54\u20131). The antimicrobial potentials of green tea (Camellia sinensis), rosemary (Rosmarinus officinalis) and ginger (Zingiber officinale) extracts against MDR Campylobacter isolates were assessed by the disk diffusion assay and broth microdilution technique. Green tea extract showed a marked inhibitory effect against tested isolates, exhibiting growth inhibition zone diameters of 8 to 38 mm and a minimum inhibitory concentration (MIC) range of 1.56\u20133.12 mg\/mL, unlike the rosemary and ginger extracts. Our findings reveal a respectable antibiofilm activity (&gt;50% biofilm formation inhibition) of green tea against the preformed biofilms of Campylobacter isolates. Furthermore, real-time quantitative polymerase chain reaction (RT-qPCR) results showed a significant decrease (p &lt; 0.05) in the expression levels of biofilm biosynthesis gene and its regulator (FlaA and LuxS, respectively) in Campylobacter isolates treated with the green tea extract in comparison with untreated ones. Conclusion: This is the first in vitro approach that has documented the inhibitory activity of green tea extract against MDR-biofilm-producing Campylobacter species isolated from different sources. Further in vivo studies in animals\u2019 models should be performed to provide evidence of concept for the implementation of this alternative candidate for the mitigation of MDR Campylobacter infections in the future.<\/jats:p>","DOI":"10.3390\/antibiotics14010061","type":"journal-article","created":{"date-parts":[[2025,1,9]],"date-time":"2025-01-09T07:00:47Z","timestamp":1736406047000},"page":"61","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Green Tea Extract (Theaceae; Camellia sinensis L.): A Promising Antimicrobial, Anti-Quorum Sensing and Antibiofilm Candidate Against Multidrug-Resistant Campylobacter Species"],"prefix":"10.3390","volume":"14","author":[{"given":"Mona S.","family":"Emara","sequence":"first","affiliation":[{"name":"Animal Health Research Institute, Zagazig 44516, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ahmed M.","family":"Ammar","sequence":"additional","affiliation":[{"name":"Department of Microbiology, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44511, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9665-4943","authenticated-orcid":false,"given":"Ashraf M.O.","family":"Abdelwahab","sequence":"additional","affiliation":[{"name":"Department of Microbiology, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44511, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Attia A.","family":"Elgdawy","sequence":"additional","affiliation":[{"name":"Animal Health Research Institute, Giza 12618, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adel","family":"Abdelkhalek","sequence":"additional","affiliation":[{"name":"Food Safety, Hygiene and Technology Department, Faculty of Veterinary Medicine, Badr University in Cairo (BUC), Badr City 11829, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9232-4165","authenticated-orcid":false,"given":"Elena","family":"Pet","sequence":"additional","affiliation":[{"name":"Faculty of Management and Rural Tourism, University of Life Sciences \u201cKing Mihai I\u201d from Timisoara, Calea Aradului 119, 300645 Timisoara, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabi","family":"Dumitrescu","sequence":"additional","affiliation":[{"name":"Faculty of Bioengineering of Animal Resources, University of Life Sciences \u201cKing Mihai I\u201d from Timisoara, Calea Aradului 119, 300645 Timisoara, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8033-8463","authenticated-orcid":false,"given":"Mirela","family":"Ahmadi","sequence":"additional","affiliation":[{"name":"Faculty of Bioengineering of Animal Resources, University of Life Sciences \u201cKing Mihai I\u201d from Timisoara, Calea Aradului 119, 300645 Timisoara, Romania"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8309-9058","authenticated-orcid":false,"given":"Norhan K.","family":"Abd El-Aziz","sequence":"additional","affiliation":[{"name":"Department of Microbiology, Faculty of Veterinary Medicine, Zagazig University, Zagazig 44511, Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,1,9]]},"reference":[{"key":"ref_1","unstructured":"World Health Organization (WHO) (2021, May 22). 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