Figure 1.
Photographs of the Pathogon (A) and Tru-D (B) devices.
Figure 2.
The effect of pathogen concentration on the efficacy of the UV-C devices.
The log10CFU reduction/cm2 of two strains of C. difficile spores, MRSA, and VRE inoculated onto carriers. Carriers contained either >5, ≤5 and >3, or ≤3 log10CFU of each pathogen. The carriers were irradiated for 41 minutes at a distance of 4 feet from the Tru-D (2A) or Pathogon (2B) device. The means of the data from experiments conducted in triplicate are presented. Error bars indicate standard error.
Figure 3.
The effect of organic load on the efficacy of the UV-C devices.
The log10CFU reduction/cm2 of C. difficile spores, MRSA, and VRE suspended in phosphate-buffered saline (PBS), light organic load (5% fetal calf serum), or heavy organic load (5% fetal calf serum, 5% tryptone). Carriers contained 6 log10CFU of each pathogen. The carriers were irradiated for 41 minutes at a distance of 4 feet from the Tru-D or Pathogon device. The means of the data from experiments conducted in triplicate are presented. Error bars indicate standard error.
Figure 4.
The effect of distance and indirect irradiation on the efficacy of the UV-C devices.
The log10CFU reduction/cm2 of C.difficile spores, MRSA, and VRE at increasing distances and shaded from the direct field of radiation delivered by the UV-C device. Carriers contained 6 log10CFU of each pathogen. The carriers were irradiated for 41 minutes at a distance of 6 in, 4 feet, 4 feet shaded, and 10 ft from the Tru-D or Pathogon device. The means of the data from experiments conducted in triplicate are presented. Error bars indicate standard error.
Figure 5.
The effect of radiant dose on the efficacy of the UV-C devices.
The log10CFU reduction/cm2 of C.difficile spores, MRSA, and VRE after receiving increasing timed doses of irradiation delivered by the UV-C devices. Carriers contained 6 log10CFU of each pathogen. The carriers were irradiated for 10, 20, 40 minutes at a distance of 4 feet from the Tru-D or Pathogon device. The means of the data from experiments conducted in triplicate are presented. Error bars indicate standard error.