{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,22]],"date-time":"2026-07-22T13:48:59Z","timestamp":1784728139719,"version":"3.55.0"},"reference-count":57,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2021,12,30]],"date-time":"2021-12-30T00:00:00Z","timestamp":1640822400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Veterinary Sciences"],"abstract":"<jats:p>This study was conducted in northeastern Tunisia to estimate both the prevalence and the risk factors of Salmonella in broiler flocks as well as to characterize the isolated multidrug-resistant (MDR) Salmonella strains. In the present study, a total number of 124 farms were sampled; Salmonella isolates were identified by the alternative technique VIDAS Easy Salmonella. The susceptibility of Salmonella isolates was assessed against 21 antimicrobials using the disk diffusion method on Mueller\u2013Hinton agar using antimicrobial discs. Some antimicrobial resistance genes were identified using PCR. The prevalence rate of Salmonella infection, in the sampled farms, was estimated at 19.9% (64\/322). Moreover, a total number of 13 different serotypes were identified. High rate of resistance was identified against nalidixic acid (82.85%), amoxicillin (81.25%), streptomycin (75%), and ciprofloxacin (75%). Alarming level of resistance to ertapenem (12.5%) was noticed. A total of 87.5% (56\/64) of isolated strains were recognized as MDR. Three MDR strains were extended-spectrum \u03b2-lactamases (ESBL)-producers and three MDR strains were cephalosporinase-producers. The blaCTX-M gene was amplified in all the three ESBL strains. The qnrB gene was not amplified in fluoroquinolones-resistant strains. The tetA and tetB genes were amplified in 5% (2\/40) and 2.5% (1\/40) of tetracycline-resistant strains, respectively. The dfrA1 gene was amplified in five of the 20 trimethoprim-resistant strains. The mcr-1, mcr-2, mcr-3, mcr-4, and mcr-5 genes were not amplified in any of the phenotypically colistin-resistant strains. In terms of integrase genes int1 and int2, only gene class 2 was amplified in 11% (7\/64) of analyzed strains. Risk factors, such as the poor level of cleaning and disinfection, the lack of antimicrobial treatment at the start of the breeding, and a crawl space duration lower than 15 days, were associated with high Salmonella infection in birds. These data should be considered when preparing salmonellosis control programs in Tunisian broiler flocks.<\/jats:p>","DOI":"10.3390\/vetsci9010012","type":"journal-article","created":{"date-parts":[[2021,12,30]],"date-time":"2021-12-30T23:29:07Z","timestamp":1640906947000},"page":"12","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Prevalence, Risk Factors, Antimicrobial Resistance and Molecular Characterization of Salmonella in Northeast Tunisia Broiler Flocks"],"prefix":"10.3390","volume":"9","author":[{"given":"Walid","family":"Oueslati","sequence":"first","affiliation":[{"name":"Laboratory of Management of Animal Production\u2019s Health and Quality, National School of Veterinary Medicine of Sidi Thabet, University Manouba, La Manouba 2010, Tunisia"},{"name":"Department of Animal Production, National Agronomic Institute, University Carthage, Carthage 1054, Tunisia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mohamed Ridha","family":"Rjeibi","sequence":"additional","affiliation":[{"name":"Laboratory of Parasitology, National School of Veterinary Medicine of Sidi Thabet, University Manouba, La Manouba 2010, Tunisia"},{"name":"Laboratory of Parasitology, Veterinary Research Institute, University de Tunis El Manar, Tunis 1068, Tunisia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hayet","family":"Benyedem","sequence":"additional","affiliation":[{"name":"Laboratory of Parasitology, National School of Veterinary Medicine of Sidi Thabet, University Manouba, La Manouba 2010, Tunisia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6825-1736","authenticated-orcid":false,"given":"Aymen","family":"Mamlouk","sequence":"additional","affiliation":[{"name":"Laboratory of Microbiology, National School of Veterinary Medicine of Sidi Thabet, University Manouba, La Manouba 2010, Tunisia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fatma","family":"Souissi","sequence":"additional","affiliation":[{"name":"Laboratory of Management of Animal Production\u2019s Health and Quality, National School of Veterinary Medicine of Sidi Thabet, University Manouba, La Manouba 2010, Tunisia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rachid","family":"Selmi","sequence":"additional","affiliation":[{"name":"Laboratory of Microbiology, National School of Veterinary Medicine of Sidi Thabet, University Manouba, La Manouba 2010, Tunisia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abdelfettah","family":"Ettriqui","sequence":"additional","affiliation":[{"name":"Laboratory of Management of Animal Production\u2019s Health and Quality, National School of Veterinary Medicine of Sidi Thabet, University Manouba, La Manouba 2010, Tunisia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,12,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"963","DOI":"10.1086\/529146","article-title":"Epidemics of invasive Salmonella enterica serovar enteritidis and S. enterica serovar typhimurium infection associated with multidrug resistance among adults and children in Malawi","volume":"46","author":"Gordon","year":"2008","journal-title":"Clin. 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