CDC Crisis Standards of Care Decontamination Recommendations Including Ultraviolet (UVGI)
UVGI is a promising method but the disinfection efficacy is dependent on dose. Not all UV lamps provide the same intensity thus treatment times would have to be adjusted accordingly.
Moreover, UVGI is unlikely to kill all the viruses and bacteria on an FFR due to shadow effects produced by the multiple layers of the FFR’s construction.
Acceptable filtration performance was recorded for eleven FFR models exposed to various UV doses ranging from roughly 0.5–950 J/cm2 and UVGI was shown to have minimal effect on fit.
Heimbuch et al. tested filtration and fit of 15 FFRs and found no adverse effects to FFR performance.
Lindsley et al. reported a reduction of the durability of materials of the FFRs for doses ranging from 120–950 J/cm2; however, an approximate inactivation of 99.9% of bacteriophage MS2, a non-enveloped virus, and H1N1 influenza A/PR/8/34 were achieved with much lower doses of approximately 1 J/cm2 [12–14].
Heimbuch et al. tested the performance of 1 J/cm2 of UVGI against Influenza A (H1N1), Avian influenza A virus (H5N1), Influenza A (H7N9) A/Anhui/1/2013, Influenza A (H7N9) A/Shanghai/1/2013, MERS-CoV, and SARS-CoV and reported virus inactivation from 99.9% to greater than 99.999%
UVGI is harmful. Proper precautions are required to avoid UVGI exposure to skin or the eyes.
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