GTRI Study

GTRI Study:

Objective: To determine the antimicrobial efficacy of LED-based UV light on various PPE materials including facemasks.

Test Factors:

  • Material
  • Challenge organism
  • Treatment exposure

I. Facemask material
A. Certified N95 mask
B. Disposable surgical masks

Challenge organism (4 bacterial strains)
A. 2-gram positive bacterial species
i. SA: Staphylococcus aureus subsp. aureus
Rosenbach (ATCC® 6538™)
ii. BA: Bacillus atrophaeus (ATCC® 9372™))

B. 2-gram negative bacterial species
i. EC: Escherichia coli (ATCC 25922™)
ii. PA: Pseudomonas aeruginosa (ATCC®

III. Treatment exposure

  • 60 seconds = one cycle (actually 66 seconds exposure)
  • 120 seconds = two cycles (actually 132 sec exposure)
  • 180 seconds = three cycles (actually 198 sec exposure)