title: Mature Pseudomonas aeruginosa biofilms prevail compared to young biofilms in the presence of ceftazidime.
abstract: Phenotypic tolerances to antibiotics of mature and young Pseudomonas aeruginosa PAO1 biofilms and released planktonic bacteria were compared for four antibiotics. Resistance levels were similar for gentamicin and ciprofloxacin but differed for ceftazidime and meropenem. β-Lactamase mapping showed that, after 5 h of ceftazidime exposure, mature biofilms produced more β-lactamase than young biofilms, facilitating the growth of released planktonic bacteria. This shows the importance of early treatment and choice of antibiotics for P. aeruginosa biofilm infections.
authors: Cangene Corporation, Research and Development, Winnipeg, Manitoba, Canada. lbowler@cangene.com.
authors: Laura L
authors: LL
authors: Bowler
authors: George G
authors: GG
authors: Zhanel
authors: T Blake
authors: TB
authors: Ball
authors: Laura L
authors: LL
authors: Saward
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D018441:Biofilms / Q000187:drug effects* / Q000254:growth & development; D002442:Ceftazidime / Q000494:pharmacology*; D002939:Ciprofloxacin / Q000494:pharmacology*; D024901:Drug Resistance, Multiple, Bacterial / Q000187:drug effects; D015870:Gene Expression / Q000187:drug effects; D005839:Gentamicins / Q000494:pharmacology*; D000077731:Meropenem; D008826:Microbial Sensitivity Tests; D010933:Plankton / Q000187:drug effects / Q000254:growth & development; D011550:Pseudomonas aeruginosa / Q000187:drug effects* / Q000201:enzymology / Q000235:genetics; D013845:Thienamycins / Q000494:pharmacology*; D013997:Time Factors; D001618:beta-Lactamases / Q000235:genetics / Q000378:metabolism
chemical_list: D000900:Anti-Bacterial Agents; D005839:Gentamicins; D013845:Thienamycins; D002939:Ciprofloxacin; D002442:Ceftazidime; D001618:beta-Lactamases; D000077731:Meropenem