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Confocal laser scanning microscopy images of (a) Pseudomonas aeruginosa, (b) Escherichia coli, and (c) methicillin-resistant Staphylococcus aureus (MRSA) and optical images of (d) P. aeruginosa, (e) E. coli, and (f) MRSA. The strains were imaged after incubation for 30 min with PPIX-MED (15.6 μM) in phosphate-buffered saline. Excitation was at 405 nm. Scale bars = 2 μm.
