In this work, we studied the development of tolerance to low-intensity violet (405 nm, 80 mW/cm2 , 72 J/cm2 ) LED radiation in a clinical antibiotic-resistant strain of Staphylococcus aureus 2a. The change in numbers during 20 cycles of irradiation was studied, the reaction of bacterial cells to oxidative stress was studied – sensitivity to the presence of hydrogen peroxide in the environment and catalase activity.
