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Disinfection treatment of planktonic and biofilm cells with peracetic acid. The graphs show the inactivation of 24-h planktonic cells (A), cells from a 48-h dispersed static biofilm (B), and cells from a 48-h dispersed continuous-flow biofilm (C) treated with 20 μg/ml peracetic acid for 15 min at 20°C of wild-type (diamonds), ΔsigB (squares), and sigB-c (triangles) strains. Data points below the detection limit (log10 [Nt/N0] ≈ −6.5) are not shown in the graphs.
