{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,27]],"date-time":"2026-02-27T01:36:15Z","timestamp":1772156175852,"version":"3.50.1"},"reference-count":35,"publisher":"Microbiology Society","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2022,2,2]]},"abstract":"\n Introduction.<\/jats:bold>\n Daptomycin and levofloxacin were tested as monotherapies and in combination against the antibiotic-susceptible\n \n \n S. aureus<\/jats:ext-link>\n <\/jats:named-content>\n <\/jats:italic>\n strain MSSA 1112 in a rabbit meningitis model and the effect of the combination on induction of resistance was determined\n in vitro<\/jats:italic>\n .\n <\/jats:p>\n \n Hypothesis\/Gap Statement.<\/jats:bold>\n Treatment combination might be more efficacious than the monotherapies regarding antibacterial efficacy\n in vivo<\/jats:italic>\n and development of resistance.\n <\/jats:p>\n \n Aim.<\/jats:bold>\n To demonstrate a synergy of the antibiotic combination daptomycin and levofloxacin in experimental meningitis, and also its ability to reduce the emergence of resistance against the antibiotics\n in vitro<\/jats:italic>\n .\n <\/jats:p>\n \n Methodology.<\/jats:bold>\n Changes of the susceptibility to fluoroquinolones and daptomycin were determined by the measurement of the MIC and mutations were detected by whole genome sequence comparison of the mutants with the parent strain MSSA 1112. Meningitis was induced by intracisternal inoculation of 10\n 5<\/jats:sup>\n \u2009c.f.u. (colony forming unit) of MSSA 1112 and treatment was started 10\u2009h later by injection of daptomycin (15\u2009mg kg\n \u22121<\/jats:sup>\n ) and levofloxacin (10\u2009mg kg\n \u22121<\/jats:sup>\n ) standard doses. Cerebrospinal fluid (CSF) samples were repeatedly collected during therapy in order to determine killing rates and results of bactericidal activity were expressed in \u0394log\n 10<\/jats:sub>\n c.f.u. ml\n -1<\/jats:sup>\n over 8\u2009h.\n <\/jats:p>\n \n Results.<\/jats:bold>\n The combination of daptomycin with levofloxacin was significantly (\n P<\/jats:italic>\n <0.001) superior to levofloxacin monotherapy and increased the antibacterial activity of daptomycin.\n In vitro<\/jats:italic>\n , MSSA 1112 was cycled over 6\u2009days with either increasing concentrations of levofloxacin or daptomycin or with a combination of levofloxacin with half of the MIC of daptomycin or daptomycin with half of the MIC of levofloxacin leading to mutations in target genes as identified by whole genome sequence analysis. Addition of low concentration of daptomycin (0.25\u2009mg\u2009l\n \u22121<\/jats:sup>\n ) reduced levofloxacin-induced resistance\n in vitro<\/jats:italic>\n . Addition of levofloxacin in low concentration (0.125\u2009mg\u2009l\n \u22121<\/jats:sup>\n ) did not influence daptomycin-induced resistance.\n <\/jats:p>\n \n Conclusion.<\/jats:bold>\n These findings highlight the lack of reciprocal interference of antibiotics in combination with regard to the development of resistance.\n <\/jats:p>","DOI":"10.1099\/jmm.0.001497","type":"journal-article","created":{"date-parts":[[2022,2,2]],"date-time":"2022-02-02T13:17:11Z","timestamp":1643807831000},"source":"Crossref","is-referenced-by-count":0,"title":["Addition of daptomycin to levofloxacin increased the efficacy of levofloxacin monotherapy against a methicillin-susceptible Staphylococcus aureus strain in experimental meningitis and prevented development of resistance in vitro"],"prefix":"10.1099","volume":"71","author":[{"given":"Philippe","family":"Cottagnoud","sequence":"first","affiliation":[{"name":"\u00c4rztezentrum S\u00fcdbahnhof, Bern, 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