{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T15:13:25Z","timestamp":1790262805003,"version":"4.1.0"},"reference-count":26,"publisher":"American Society for Microbiology","issue":"8","license":[{"start":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T00:00:00Z","timestamp":1785801600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T00:00:00Z","timestamp":1785801600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.asm.org\/non-commercial-tdm-license"}],"funder":[{"name":"UGC, India","award":["231620010720"],"award-info":[{"award-number":["231620010720"]}]},{"name":"UGC, India","award":["3363\/CSIR-UGC"],"award-info":[{"award-number":["3363\/CSIR-UGC"]}]},{"name":"ICMR-National Institute for Research in Bacterial Infections, Kolkata","award":["ICMR-NIRBI"],"award-info":[{"award-number":["ICMR-NIRBI"]}]},{"name":"National Institute of Infectious Diseases, Japan","award":["NIID-4"],"award-info":[{"award-number":["NIID-4"]}]},{"name":"DBT, India","award":["DBT-RRF"],"award-info":[{"award-number":["DBT-RRF"]}]}],"content-domain":{"domain":["journals.asm.org"],"crossmark-restriction":true},"short-container-title":["Microbiol Spectr"],"published-print":{"date-parts":[[2026,8,4]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title\/>\n                    <jats:p>\n                      Shigellosis remains a major global health burden, and the increasing prevalence of multidrug-resistant (MDR)\n                      <jats:italic toggle=\"yes\">Shigella<\/jats:italic>\n                      strains is complicating effective antibiotic therapy. Bacteria may survive antibiotics by transitioning into cell wall-deficient L-forms, which are intrinsically resistant to \u03b2-lactams and can revert to a virulent state, potentially causing relapsing infections. Here, we characterized a clinical MDR isolate\n                      <jats:italic toggle=\"yes\">Shigella sonnei<\/jats:italic>\n                      HK8, a.k.a. PD552A, whose genome contains key resistance (\n                      <jats:italic toggle=\"yes\">gyrA<\/jats:italic>\n                      , PBP3) and virulence (\n                      <jats:italic toggle=\"yes\">icsA<\/jats:italic>\n                      ) genes. Exposure to ceftriaxone induced a transition into a viable L-form state that was hyper-adhesive to macrophages\n                      <jats:italic toggle=\"yes\">in vitro<\/jats:italic>\n                      . However, this survival adaptation was linked to a profound loss of pathogenicity. Using murine and guinea pig models, the L-form variant was shown to be severely attenuated, failing to cause keratoconjunctivitis, diarrheal disease, or significant histopathology characteristic of the wild-type strain. These findings reveal a critical virulence-survival trade-off, positioning the L-form as a \u201cstealth\u201d phenotype that enables bacterial persistence at the expense of acute virulence. This offers a potential mechanism for asymptomatic carriage and recurrent infections, highlighting a previously underappreciated mechanism by which antibiotic treatment may resolve acute symptoms while permitting the persistence of a cryptic bacterial reservoir capable of driving recurrent infection.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>IMPORTANCE<\/jats:title>\n                    <jats:p>\n                      Our research provides critical insight into the challenge of antibiotic treatment failure in shigellosis. By integrating experimental validation of reversible L-form transitions with mathematical modeling, we uncover a crucial virulence-survival trade-off. We show that multidrug-resistant\n                      <jats:italic toggle=\"yes\">Shigella sonnei<\/jats:italic>\n                      survives ceftriaxone by adopting a \u201cstealth\u201d phenotype, quantified by a high stealth index\u2014maintaining bacterial burden while evading host inflammatory detection. These findings imply that standard antibiotics may resolve acute symptoms while inadvertently selecting for a cryptic, persistent reservoir poised for relapse. This work challenges the conventional view of therapeutic success and highlights an urgent need to develop novel diagnostic and therapeutic strategies capable of identifying and eliminating these resilient, \u201cstealth\u201d L-form persisters to achieve true bacterial clearance and prevent chronic infections.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1128\/spectrum.02246-25","type":"journal-article","created":{"date-parts":[[2026,6,22]],"date-time":"2026-06-22T12:00:42Z","timestamp":1782129642000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":1,"title":["Third-generation cephalosporin-induced L-form transition in\n                    <i>Shigella sonnei<\/i>\n                    reveals a virulence-survival trade-off underlying persistent infection"],"prefix":"10.1128","volume":"14","author":[{"given":"Sanjib","family":"Das","sequence":"first","affiliation":[{"name":"Division of 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