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. 2021 Jul 25;49(10):1227–1231. doi: 10.1016/j.ajic.2021.07.012

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© 2021 Association for Professionals in Infection Control and Epidemiology, Inc. Published by Elsevier Inc. All rights reserved.

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Fig 1 — Reduction of viral burden and retention of filtration efficiency of unexpired N95 FFR after VHP processing a) Viable virus recovery of SARS-CoV-2 and HCoV-229E from 3M 8210 and 3M 9210+ respirators: negative ctrl: no virus laced on FFR; elution ctrl: immediate recovery of virus; time lapse ctrl: viral recovery alongside processed FFR; VHP: viral recovery from processed FFR. 4-log reduction of SARS-CoV-2 titre and 5-log reduction of HCoV-229E titre was observed after VHP processing b) Filtration efficiency of 3M 8210 and 3M 9210+ FFRs after 1 cycle VHP processing by the NIOSH and ATSM testing protocols; Dashed line indicates design standard of 95% filtration efficiency (n=10 for all tests except unexpired 9210+ where n=9). i) Unexpired FFRs showed consistent filtration efficiencies >95% using both testing standards ii) Expired FFRs revealed failures by the NIOSH testing after 1 cycle of VHP decontamination with 4 of 10 FFRs showing <95% efficiency according to the NIOSH test.