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Photoeffect of protoporphyrin IX (PPIX) against isogenic Staphylococcus aureus strains. The cells were illuminated after dark incubation for 30 min at 37°C with 25 μM PPIX with the light dose of 50 J/cm2. The survival rate was calculated from the number of colony-forming units (CFU) in the photodynamic inactivation (PDI)-treated sample divided by the number of CFU in the sample irradiated without photosensitizer. Each experiment was done three times, and error bars show SD.
