Approach of using a household device in decontaminating respirators with ultraviolet C during the scarcity in the COVID-19 pandemic [post]

Darunee Chotiprasitsakul, Taya Kitiyakara, Anan Jongkaewwattana, Pitak Santanirand, Atisak Jiaranaikulwanich, Chureetat Prahsarn, Naruporn Monmaturapoj, Phattira Wadwongsri, Nunnarin Jeendum, Siriorn P. Watcharananan
2020 unpublished
Background Reusing N95 respirators with a practical and easy decontamination protocol might be a solution for the shortage of N95 respirators. We aimed to study the reliability and safety of household UV-C devices for the decontamination of N95 respirators. Methods We investigated a baby bottle ultraviolet C (UV-C) sterilizer box for N95 decontamination. Swine coronavirus (PEDV) was sprayed on the N95 and the virus was cultivated after UV-C sterilization. Bacterial culture from used N95
more » ... or was performed before and after UV-C exposure. Scanning electron Microscopy (SEM) was used to observe the structural change after UV-C exposure. The radiation was measured by radiometer. The fit test was performed on 3 participants before use, and after reuse 4 and 6 times. Results The PEDV sprayed on the N95 respirator was inactivated by the UV-C level of 0.930–0.932 mW/cm2. Nearly all bacterial colonies had disappeared after the 10 min of the UV-C exposure. No significant change to the structure of the N95 polymer fibers after 240 min of UV-C exposure was observed by SEM. Three and two participants passed the fit test after the fourth and sixth time of reuse, respectively. Conclusions During the COVID-19 pandemic crisis, UV-C products may be practical and safe options for decontaminating N95 respirators, if the energy of UV-C is in the range known to deactivate the virus.
doi:10.21203/ fatcat:gek5pec2wrdldiejdnwjnw2dma