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Toward a Test Protocol for Surface Decontamination Using a Mobile Whole-room UVGI Device†.

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Shadows significantly reduce the effectiveness of mobile whole-room UVGI devices. Bacillus atrophaeus spores are recommended for testing UVGI device performance in shadowed areas to improve pathogen control.

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Area of Science:

  • Microbiology
  • Infectious Disease Control
  • Environmental Science

Background:

  • Mobile whole-room UV germicidal irradiation (UVGI) devices are crucial for controlling surface pathogens in healthcare.
  • A lack of standardized methods hinders the comparison of UVGI device efficacy.
  • Understanding the impact of shadows on UVGI inactivation is essential for optimizing disinfection protocols.

Purpose of the Study:

  • To evaluate the effect of shadows on the inactivation efficacy of a mobile whole-room UVGI device.
  • To compare the performance of UVGI against direct, reflected, and combined UV exposure using microbial surrogates.
  • To establish a model organism for assessing UVGI performance under shadowed conditions.

Main Methods:

  • Utilized Bacillus atrophaeus spores as a surrogate for Clostridium difficile and Staphylococcus aureus for Methicillin-resistant Staphylococcus aureus (MRSA).
  • Exposed microbial surrogates to UVC 254 nm light from a mobile whole-room UVGI device for 10 minutes.
  • Measured log reductions in microbial populations under conditions of direct UV, reflected UV, and combined exposure; quantified reflected UV dose.

Main Results:

  • Inactivation varied significantly based on UV exposure type: direct UV yielded 4.3 log reduction (B. atrophaeus) and 5.5 log reduction (S. aureus).
  • Reflected UV exposure alone resulted in <1.0 log reduction (B. atrophaeus) and ~2.75 log reduction (S. aureus).
  • Combined direct and reflected UV exposure showed intermediate log reductions, with reflected dose measuring 0.46%–1.47%.

Conclusions:

  • Bacillus atrophaeus spores are a suitable model organism for testing the impact of shadows on mobile whole-room UVGI device efficacy.
  • Optimizing the reflected component of UVGI is critical, particularly for inactivating UVC-resistant microorganisms.
  • Standardized methods are needed to compare mobile whole-room UVGI devices, considering shadow effects for effective pathogen control.