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Mean (with standard error of the mean) thickness (A) and percent dead (B) of intermediately (black bars, n = 5) and highly (white bars, n = 5) resistant Achromobacter xylosoxidans CF isolates treated with increasing concentrations of tobramycin in the biofilm slide chamber model. *, P ≤ 0.05; **, P ≤ 0.01 compared to the untreated control.
