Table 1

Log kill efficacy in ozone-exposed respirator pieces compared with the controls

RespiratorCase numberLog CFUs/respirator piece (control group)Log CFUs/respirator piece (ozone group)Kill yield
log
3M 18701.18.48ND>8
1.29.48ND>9
1.37.95ND>7
1.48.00ND>8
  • Kill yield log is expressed as the base 10 logarithm of the reduction in organisms. Log 3 = 99.9%, log 6 = 99.9999%, etc. Greater than log 7 kill of Pseudomonas aeruginosa bacteria was achieved on heavily inoculated pieces of N95 masks using 400 ppm ozone for 2 hours with relative humidity 80%.

  • CFU, colony-forming units; ND, not detected.