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10.1503/cmaj.201203

http://scihub22266oqcxt.onion/10.1503/cmaj.201203
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32732229!7588253!32732229
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suck abstract from ncbi


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pmid32732229      CMAJ 2020 ; 192 (41): E1189-E1197
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  • Effect of moist heat reprocessing of N95 respirators on SARS-CoV-2 inactivation and respirator function #MMPMID32732229
  • Daeschler SC; Manson N; Joachim K; Chin AWH; Chan K; Chen PZ; Tajdaran K; Mirmoeini K; Zhang JJ; Maynes JT; Zhang L; Science M; Darbandi A; Stephens D; Gu F; Poon LLM; Borschel GH
  • CMAJ 2020[Oct]; 192 (41): E1189-E1197 PMID32732229show ga
  • BACKGROUND: Unprecedented demand for N95 respirators during the coronavirus disease 2019 (COVID-19) pandemic has led to a global shortage of these masks. We validated a rapidly applicable, low-cost decontamination protocol in compliance with regulatory standards to enable the safe reuse of N95 respirators. METHODS: We inoculated 4 common models of N95 respirators with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and evaluated viral inactivation after disinfection for 60 minutes at 70 degrees C and 0% relative humidity. Similarly, we evaluated thermal disinfection at 0% to 70% relative humidity for masks inoculated with Escherichia coli. We assessed masks subjected to multiple cycles of thermal disinfection for structural integrity using scanning electron microscopy and for protective functions using standards of the United States National Institute for Occupational Safety and Health for particle filtration efficiency, breathing resistance and respirator fit. RESULTS: A single heat treatment rendered SARS-CoV-2 undetectable in all mask samples. Compared with untreated inoculated control masks, E. coli cultures at 24 hours were virtually undetectable from masks treated at 70 degrees C and 50% relative humidity (optical density at 600 nm wavelength, 0.02 +/- 0.02 v. 2.77 +/- 0.09, p < 0.001), but contamination persisted for masks treated at lower relative humidity. After 10 disinfection cycles, masks maintained fibre diameters similar to untreated masks and continued to meet standards for fit, filtration efficiency and breathing resistance. INTERPRETATION: Thermal disinfection successfully decontaminated N95 respirators without impairing structural integrity or function. This process could be used in hospitals and long-term care facilities with commonly available equipment to mitigate the depletion of N95 masks.
  • |*Betacoronavirus[MESH]
  • |COVID-19[MESH]
  • |Coronavirus Infections/*epidemiology[MESH]
  • |Disease Transmission, Infectious/*prevention & control[MESH]
  • |Disinfection/*methods[MESH]
  • |Hot Temperature[MESH]
  • |Humans[MESH]
  • |Pandemics/*prevention & control[MESH]
  • |Pneumonia, Viral/*epidemiology[MESH]
  • |Respiratory Protective Devices/*standards[MESH]


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