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Despite growing interest in phage-antibiotic synergy, this study evaluates the underexplored combinatorial effects of phage and antibiotics, including drug-specific interactions and sequence dependency, against the biofilm-forming MDR-HvKp clinical strain.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods and results<\/jats:title>\n                    <jats:p>A T5-like Klebsiella bacteriophage, Round, within the genus Webervirus, was therapeutically and genomically characterized. A biofilm-forming clinical strain, Kleb_134, was used to evaluate in vitro phage-antibiotic interactions with meropenem, colistin, and tigecycline in planktonic and biofilm models.<\/jats:p>\n                    <jats:p>In planktonic assays, phage combinations with meropenem and colistin resulted in a multi-log CFU reduction compared to monotherapies, whereas reduced efficacy was observed with tigecycline. In biofilm assays, pre-phage treatment followed by antibiotic exposure demonstrated the strongest biofilm reduction. Drug-specific and sequence-dependent effects were evident. Meropenem-phage combinations reduced biofilm biomass by 2.85-fold (high phage titre) and 3.8-fold (low phage titre), while colistin-phage combinations achieved reductions of 8.4-fold (high phage titre) and 2.8-fold (low phage titre).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Sequential phage-antibiotic treatment was effective against MDR-HvKp biofilms, with pre-phage exposure enhancing antibiotic access through biofilm disruption. The bacteriostatic nature of tigecycline reduced efficacy by affecting phage replication. These findings highlight the importance of treatment sequence and antibiotic selection, and extend existing knowledge in optimizing therapeutic outcomes in MDR-HvKp infections.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/jambio\/lxag204","type":"journal-article","created":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T11:33:10Z","timestamp":1786707190000},"source":"Crossref","is-referenced-by-count":1,"title":["Evaluation of sequential phage-antibiotic therapy reveals enhanced biofilm control with meropenem and colistin in clinical MDR hypervirulent\n                    <i>Klebsiella pneumoniae<\/i>\n                    strain"],"prefix":"10.1093","volume":"137","author":[{"given":"Ramya","family":"Juliet","sequence":"first","affiliation":[{"name":"Center for Advanced Research in Bacteriophage and Infectious Diseases, School of Bio Sciences and Technology, Vellore Institute of Technology (VIT) , Vellore 632014, Tamil Nadu 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