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Radiation and filtration are essential tools for microbial control, targeting microorganisms through distinct mechanisms. Radiation eliminates microbes by damaging their DNA, either killing them or inhibiting their growth. Based on wavelength, radiation is classified into two types: nonionizing and ionizing radiation.Non-ionizing radiation, such as UV radiation (200–400 nm), is absorbed by DNA, causing defects that effectively disinfect surfaces, air, and water, including safety cabinets.
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Skin tolerant inactivation of multiresistant pathogens using far-UVC LEDs.

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A novel far-ultraviolet C (far-UVC) system effectively inactivates methicillin-resistant Staphylococcus aureus (MRSA). This system shows minimal DNA damage to skin, suggesting safe clinical application for eradicating resistant pathogens.

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Area of Science:

  • Microbiology
  • Biophysics
  • Dermatology

Background:

  • Multiresistant pathogens, like methicillin-resistant Staphylococcus aureus (MRSA), pose significant risks for postoperative infections.
  • Current disinfection methods may have limitations in clinical settings.

Purpose of the Study:

  • To present a novel skin-tolerant far-ultraviolet C (far-UVC) irradiation system for inactivating MRSA.
  • To evaluate the efficacy and safety of this system on bacterial inactivation and skin damage.

Main Methods:

  • Development of a far-UVC system using UVC LEDs and a spectral filter, emitting at 233 nm.
  • Inactivation of MRSA on agar plates using irradiation doses from 15-40 mJ/cm².
  • Assessment of DNA damage (CPD and 6-4PP) in porcine skin after irradiation at 233 nm and 254 nm.

Main Results:

  • MRSA inactivation was achieved with doses ranging from 15-40 mJ/cm².
  • Irradiation at 233 nm caused significantly less DNA damage (3.7% CPD, 2.3% 6-4PP) in porcine skin compared to 254 nm irradiation (15-30 times higher).
  • The observed DNA damage at 233 nm is expected to be repairable by natural skin mechanisms.

Conclusions:

  • The developed 233 nm far-UVC system effectively inactivates MRSA.
  • The system demonstrates a favorable safety profile for human skin due to minimal DNA damage.
  • LED-based far-UVC technology holds promise for clinical applications in eradicating multiresistant pathogens directly on patients.