{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,21]],"date-time":"2026-05-21T02:13:32Z","timestamp":1779329612048,"version":"3.51.4"},"reference-count":55,"publisher":"Oxford University Press (OUP)","issue":"11","license":[{"start":{"date-parts":[[2019,8,19]],"date-time":"2019-08-19T00:00:00Z","timestamp":1566172800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2019,11,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Eradicating bacterial biofilm without mechanical dispersion remains a challenge. Combination therapy has been suggested as a suitable strategy to eradicate biofilm.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p>To evaluate the efficacy of a ciprofloxacin\/amikacin combination in a model of in vitro Pseudomonas aeruginosa biofilm.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The antibacterial activity of ciprofloxacin and amikacin (alone, in combination and successively) was evaluated by planktonic and biofilm time\u2013kill assays against five P. aeruginosa strains: PAO1, a WT clinical strain and three clinical strains overexpressing the efflux pumps MexAB-OprM (AB), MexXY-OprM (XY) and MexCD-OprJ (CD), respectively. Amikacin MIC was 16\u2009mg\/L for XY and ciprofloxacin MIC was 0.5\u2009mg\/L for CD. The other strains were fully susceptible to ciprofloxacin and amikacin. The numbers of total and resistant cells were determined.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In planktonic cultures, regrowth of high-level resistant mutants was observed when CD was exposed to ciprofloxacin alone and XY to amikacin alone. Eradication was obtained with ciprofloxacin or amikacin in the other strains, or with the combination in XY and CD strains. In biofilm, bactericidal reduction after 8\u2009h followed by a mean 4\u2009log10\u2009cfu\/mL plateau in all strains and for all regimens was noticed. No regrowth of resistant mutants was observed whatever the antibiotic regimen. The bacterial reduction obtained with a second antibiotic used simultaneously or consecutively was not significant.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The ciprofloxacin\/amikacin combination prevented the emergence of resistant mutants in low-level resistant strains in planktonic cultures. Biofilm persister cells were not eradicated, either with monotherapy or with the combination.<\/jats:p><\/jats:sec>","DOI":"10.1093\/jac\/dkz355","type":"journal-article","created":{"date-parts":[[2019,7,24]],"date-time":"2019-07-24T11:25:50Z","timestamp":1563967550000},"page":"3252-3259","source":"Crossref","is-referenced-by-count":7,"title":["Efficacy of a ciprofloxacin\/amikacin combination against planktonic and biofilm cultures of susceptible and low-level resistant Pseudomonas aeruginosa"],"prefix":"10.1093","volume":"74","author":[{"given":"Ana\u00efs","family":"Soares","sequence":"first","affiliation":[{"name":"EA 2656 (GRAM), Normandie Univ, Unirouen, Rouen, France"},{"name":"Microbiology Department, Rouen University Hospital, Rouen, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7773-5695","authenticated-orcid":false,"given":"K\u00e9vin","family":"Alexandre","sequence":"additional","affiliation":[{"name":"EA 2656 (GRAM), 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