Decontamination of surgical face masks and N95 respirators by dry heat pasteurization for one hour at 70°C
Decontamination of surgical face masks and N95 respirators by dry heat pasteurization for one hour at 70°C
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DOI：
10.1016/j.ajic.2020.05.026
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发表时间：
2020-08-01
影响因子：
4.9
通讯作者：
Gu, Wenzhen
中科院分区：
文献类型：
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作者：
Xiang, Yi;Song, Qifa;Gu, Wenzhen
背景：在当前COVID-19大流行期间，对防护口罩的需求大大超过了其全球供应量。方法：优化干热巴氏灭菌法的温度，既能杀灭病原菌，又能在保持口罩过滤能力的前提下对口罩进行消毒。结果：本研究表明，60℃和70℃干热处理1小时，可成功杀灭6种呼吸道细菌和1种真菌，灭活H1N1指示病毒。在70度高温下加热1、2、3小时后，N95口罩和外科口罩的形状和组成没有变化。细菌气溶胶对N95口罩的过滤效率在加热1小时、2小时和3小时后分别为98%、98%和97%，均超过95%的要求效率，与加热前的值（99%）相近。手术口罩加热1、2、3小时的过滤效率分别为97%、97%、96%，与加热前的过滤效率（97%）相近。结论：该方法可在家庭使用，可显著解决目前口罩短缺的问题。(C)传染病控制与流行病学专业人员协会，2020；Elsevier Inc.出版。版权所有。
Background: The need for protective masks greatly exceeds their global supply during the current COVID-19 pandemic.Methods: We optimized the temperature used in the dry heat pasteurization method to destroy pathogens and decontaminate masks while retaining their filtering capacity.Results: The current study showed that dry heat at both 60 degrees C and 70 degrees C for 1 hour could successfully kill 6 species of respiratory bacteria and one fungi species, and inactivate the H1N1 indicator virus. After being heated at 70 degrees C for 1, 2, and 3 hours, the N95 respirators and surgical face masks showed no changes in their shape and components. The filtering efficiency of bacterial aerosol for N95 respirators were 98%, 98%, and 97% after being heated for 1, 2, and 3 hour, respectively, all of which were over the 95% efficiency required and similar to the value before being heated (99%). The filtering efficiency for surgical face masks was 97%, 97%, and 96% for 1, 2, and 3 hours of heating, respectively, all of which were also similar to the value before being heated (97%).Conclusions: This method can be used at home and can significantly resolve the current shortage of masks. (C) 2020 Association for Professionals in Infection Control and Epidemiology, Inc. Published by Elsevier Inc. All rights reserved.