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Whole-genome sequencing identified\n                      <jats:italic toggle=\"yes\">bla<\/jats:italic>\n                      <jats:sub>BAS-1<\/jats:sub>\n                      within a mobile genetic element associated with IS\n                      <jats:italic toggle=\"yes\">4351<\/jats:italic>\n                      . Cloning, susceptibility testing, \u03b2-lactam inactivation method, and half-maximal inhibitory concentration assay confirmed resistance to penicillins, cephalosporins, monobactams, and reduced susceptibility to the \u03b2-lactamase inhibitors. To date, no class A \u03b2-lactamase from\n                      <jats:italic toggle=\"yes\">Bacteroides<\/jats:italic>\n                      has been shown to display such a resistant profile, challenging the assumed reliability of \u03b2-lactam\/\u03b2-lactamase inhibitor combinations.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1128\/aac.00391-26","type":"journal-article","created":{"date-parts":[[2026,6,15]],"date-time":"2026-06-15T12:01:46Z","timestamp":1781524906000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Characterization of BAS-1, a novel class A \u03b2-lactamase encoded in\n                    <i>Bacteroides thetaiotaomicron<\/i>"],"prefix":"10.1128","volume":"70","author":[{"given":"Mar\u00eda 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