{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,3]],"date-time":"2026-11-03T15:21:48Z","timestamp":1793719308969,"version":"4.6.1"},"reference-count":89,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2025,3,7]],"date-time":"2025-03-07T00:00:00Z","timestamp":1741305600000},"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. Microbiol."],"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>\n                      Hypervirulent and multidrug-resistant\n                      <jats:italic>Klebsiella pneumoniae<\/jats:italic>\n                      (hvKP and MDR-KP) are significant public health threats. This study aimed to isolate a lytic bacteriophage targeting these high-risk strains, systematically characterize its biological properties, genomic features, and therapeutic efficacy, and establish a foundation for clinical phage therapy and novel antimicrobial development.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      The phage vB_Kp_XP4 was isolated from river water using the double-layer agar plate method with the clinically isolated strain P4 as the host. Morphology was analyzed via transmission electron microscopy (TEM). Host range, pH, and thermal stability were assessed using spot assays and OD\n                      <jats:sub>630<\/jats:sub>\n                      measurements. One-step growth curves determined the latent period and burst size. Whole-genome sequencing and phylogenetic analysis were performed. Therapeutic efficacy and safety were evaluated in a\n                      <jats:italic>Galleria mellonella<\/jats:italic>\n                      infection model.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      TEM revealed Phage vB_Kp_XP4 as a tailed phage with an icosahedral head and a long, flexible tail. It lysed an hvKP strain (carrying\n                      <jats:italic>rmp<\/jats:italic>\n                      ,\n                      <jats:italic>peg<\/jats:italic>\n                      ,\n                      <jats:italic>iuc<\/jats:italic>\n                      ,\n                      <jats:italic>iro<\/jats:italic>\n                      genes) and an MDR-KP strain (resistant to carbapenems, fluoroquinolones, etc.), with an optimal MOI of 0.1 and latent period &amp;lt;10 minutes. Stability was maintained at pH 4\u201311 and \u226470\u00b0C. Whole-genome sequencing revealed a linear double-stranded DNA genome of 44,344 bp with a G+C content of 53.80%. The genome comprised 54 coding sequences and lacked lysogenic, virulence, or antibiotic resistance genes. Phylogenetic analysis positioned phage vB_Kp_XP4 as a novel species within the genus\n                      <jats:italic>Drulisvirus<\/jats:italic>\n                      , family\n                      <jats:italic>Autographiviridae<\/jats:italic>\n                      . In the\n                      <jats:italic>Galleria mellonella<\/jats:italic>\n                      model, vB_Kp_XP4 prolonged survival of P4-infected larvae (\n                      <jats:italic>P<\/jats:italic>\n                      &amp;lt; 0.001)\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>\n                      Phage vB_Kp_XP4 exhibits high stability, specificity, potent lytic activity, and no undesirable genes, demonstrating effective in vivo therapeutic efficacy, suggest its potential for clinical applications against\n                      <jats:italic>Klebsiella pneumoniae<\/jats:italic>\n                      infections. The presence of multiple halos during plaque formation further enhances its research value. The complete genome sequence has been submitted to GenBank under accession number PP663283.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fmicb.2025.1491961","type":"journal-article","created":{"date-parts":[[2025,3,7]],"date-time":"2025-03-07T01:52:01Z","timestamp":1741312321000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":14,"title":["Isolation, characterization, and genomic analysis of a novel bacteriophage vB_Kp_XP4 targeting hypervirulent and multidrug-resistant Klebsiella pneumoniae"],"prefix":"10.3389","volume":"16","author":[{"given":"Xiaocui","family":"Peng","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianliang","family":"Chang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongxia","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaoyu","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changhong","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shiyan","family":"Jiao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chengxiu","family":"Lv","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Na","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bu","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhihua","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2025,3,7]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","first-page":"629","DOI":"10.1016\/S0140-6736(21)02724-0","article-title":"Global burden of bacterial antimicrobial resistance in 2019: A systematic analysis","volume":"399","year":"2022","journal-title":"Lancet"},{"key":"ref2","doi-asserted-by":"publisher","first-page":"75","DOI":"10.1186\/1471-2164-9-75","article-title":"The RAST server: rapid annotations using subsystems technology","volume":"9","author":"Aziz","year":"2008","journal-title":"BMC Genomics"},{"key":"ref3","doi-asserted-by":"publisher","first-page":"112048","DOI":"10.1016\/j.celrep.2023.112048","article-title":"Genetic determinants of host tropism in Klebsiella phages","volume":"42","author":"Beamud","year":"2023","journal-title":"Cell Rep."},{"key":"ref4","doi-asserted-by":"publisher","first-page":"3491","DOI":"10.1093\/jac\/dkaa345","article-title":"Res finder 4.0 for predictions of phenotypes from genotypes","volume":"75","author":"Bortolaia","year":"2020","journal-title":"J. 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