Fig. 3. (a) Confocal fluorescence images of PA-infected RAW264.7 cells treated with PBS (control), HMnO₂@NM, PMB and PMB@HMnO₂@NM. Scale bar, 20 μm. (b) Photographs of CFU and CFU counting (c) of PA released from macrophages under different treatments. (d) Crystal violet staining photographs of biofilms after different treatments. (e) Inhibition rates of biofilms after treatment with PBS (control), HMnO₂@NM, PMB and PMB@HMnO₂@NM (47.08 μg mL⁻¹ of PMB) (n = 3, *p < 0.05, **p < 0.01, ***p < 0.001, n.s. means no significance. Data are expressed in mean ± SD).