{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T15:53:29Z","timestamp":1790610809534,"version":"4.1.0"},"reference-count":72,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2025,3,13]],"date-time":"2025-03-13T00:00:00Z","timestamp":1741824000000},"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. Cell. Infect. Microbiol."],"abstract":"<jats:p>\n                    Salmonellosis, caused by non-typhoidal\n                    <jats:italic>Salmonella<\/jats:italic>\n                    , is a common foodborne gastrointestinal infection. Third-generation cephalosporins are recommended as the first-line treatment for\n                    <jats:italic>Salmonella<\/jats:italic>\n                    infections. Our study aimed to investigate the molecular epidemiology, antimicrobial resistance, and the transmission of extended-spectrum \u03b2-lactamases (ESBL) genes in 96 clinical\n                    <jats:italic>Salmonella<\/jats:italic>\n                    isolates collected between 2020 and 2022 at a tertiary hospital in Shenzhen, China. We performed antimicrobial susceptibility testing and whole-genome sequencing to identify serotypes, multilocus sequence typing, antimicrobial resistance genes in these isolates, and the genetic structures of the\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CTX-M<\/jats:sub>\n                    \/\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CMY<\/jats:sub>\n                    genes. Seventeen\n                    <jats:italic>Salmonella<\/jats:italic>\n                    serotypes were identified, with\n                    <jats:italic>S<\/jats:italic>\n                    . 4,[5],12:i:- (37.5%) being the most common, followed by\n                    <jats:italic>S<\/jats:italic>\n                    . Enteritidis (15.63%),\n                    <jats:italic>S<\/jats:italic>\n                    . Typhimurium (14.58%),\n                    <jats:italic>S.<\/jats:italic>\n                    London (7.29%), and\n                    <jats:italic>S.<\/jats:italic>\n                    Rissen (5.21%). MLST analysis revealed 19 distinct sequence types (STs), with ST34 being the most prevalent (36.46%), followed by ST11 (15.63%) and ST19 (13.54%). Antimicrobial resistance testing showed those isolates had high levels of resistance to ampicillin (72.92%) and tetracycline (71.88%), with 70.83% of isolates as multidrug-resistant (MDR). Three\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CTX-M<\/jats:sub>\n                    genes (\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CTX-M-14,<\/jats:sub>\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CTX-M-55<\/jats:sub>\n                    , and\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CTX-M-65<\/jats:sub>\n                    ) and\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CMY-2<\/jats:sub>\n                    were identified among 18 cefotaxime-resistant strains, of which one and 12 isolates successfully transferred\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CMY<\/jats:sub>\n                    or\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CTX-M<\/jats:sub>\n                    to\n                    <jats:italic>E. coli<\/jats:italic>\n                    C600 via conjugation, respectively. The\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CTX-M<\/jats:sub>\n                    \/\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CMY-2<\/jats:sub>\n                    -carrying contigs in nine\n                    <jats:italic>Salmonella<\/jats:italic>\n                    isolates ranged from 2,156 to 164,862 bp, were located either on the chromosome (n=1) or plasmids (IncI1, IncK1, IncA\/C) (n=9), and the\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CTX-M<\/jats:sub>\n                    \/\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CMY-2<\/jats:sub>\n                    genes were associated with IS\n                    <jats:italic>Ecp1<\/jats:italic>\n                    . Our study demonstrates the diversity of MDR\n                    <jats:italic>Salmonella<\/jats:italic>\n                    serotypes in clinical isolates, and highlights the role of plasmids and mobile genetic elements in the horizontal transfer of\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CTX-M<\/jats:sub>\n                    \/\n                    <jats:italic>bla<\/jats:italic>\n                    <jats:sub>CMY<\/jats:sub>\n                    , emphasizing the need for continuous surveillance of\n                    <jats:italic>Salmonella<\/jats:italic>\n                    in clinical samples.\n                  <\/jats:p>","DOI":"10.3389\/fcimb.2025.1544757","type":"journal-article","created":{"date-parts":[[2025,3,13]],"date-time":"2025-03-13T03:04:12Z","timestamp":1741835052000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":4,"title":["Stool carriage of CTX-M\/CMY-producing Salmonella enterica in a Chinese tertiary hospital in Shenzhen, China"],"prefix":"10.3389","volume":"15","author":[{"given":"Jing","family":"Wang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zi-Han","family":"Dong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xian-Yuan","family":"Zhou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qin-Chun","family":"Ma","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhen-Yu","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dachuan","family":"Lin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ying-Feng","family":"Huang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chi","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinan","family":"Jiao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Deng","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qiuchun","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2025,3,13]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"11","DOI":"10.1099\/jmm.0.000874","article-title":"Fosfomycin: mechanisms and the increasing prevalence of resistance","volume":"68","author":"Aghamali","year":"2019","journal-title":"J. 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