Dry Heat as a Decontamination Method for N95 Respirator Reuse,Environmental Science & Technology Letters

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Dry Heat as a Decontamination Method for N95 Respirator Reuse
Environmental Science & Technology Letters ( IF 8.9 ) Pub Date : 2020-07-15 , DOI: 10.1021/acs.estlett.0c00534
Chamteut Oh ₁ , Elbashir Araud ₂ , Joseph V Puthussery ₁ , Hezi Bai ₁ , Gemma G Clark ₁ , Leyi Wang ₃ , Vishal Verma ₁ , Thanh H Nguyen _{1,

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Affiliation

A pandemic such as COVID-19 can cause a sudden depletion of the worldwide supply of respirators, forcing healthcare providers to reuse them. In this study, we systematically evaluated dry heat treatment as a viable option for the safe decontamination of N95 respirators (1860, 3M) before their reuse. We found that the dry heat generated by an electric cooker (100 °C, 5% relative humidity, 50 min) effectively inactivated Tulane virus (TV, >5.2-log₁₀ reduction), rotavirus (RV, >6.6-log₁₀ reduction), adenovirus (AdV, >4.0-log₁₀ reduction), and transmissible gastroenteritis virus (TGEV, >4.7-log₁₀ reduction). The respirator integrity (determined on the basis of the particle filtration efficiency and quantitative fit testing) was not compromised after 20 cycles of a 50 min dry heat treatment. On the basis of these results, dry heat decontamination generated by an electric cooker (e.g., rice cookers, instant pots, and ovens) could be an effective and accessible decontamination method for the safe reuse of N95 respirators. We recommend users measure the temperature during decontamination to ensure the respirator temperature can be maintained at 100 °C for 50 min.

中文翻译：

干热作为 N95 呼吸器重复使用的净化方法

像 COVID-19 这样的大流行病可能会导致全球呼吸器供应突然耗尽，迫使医疗保健提供者重复使用它们。在这项研究中，我们系统地评估了干热处理作为 N95 呼吸器（1860，3M）重复使用前安全净化的可行选择。我们发现电饭锅产生的干热（100 °C，5% 相对湿度，50 分钟）可有效灭活杜兰病毒（TV，>5.2-log 10 减少）、轮状病毒（_RV，>6.6-log ₁₀减少）、腺病毒（AdV，>4.0-log ₁₀减少）和传染性胃肠炎病毒（TGEV，>4.7-log ₁₀减少）。经过 20 个 50 分钟干热处理循环后，呼吸器完整性（根据颗粒过滤效率和定量贴合测试确定）并未受到损害。根据这些结果，电饭锅（例如电饭锅、速溶锅和烤箱）产生的干热去污可能是安全重复使用 N95 口罩的有效且易于使用的去污方法。我们建议用户在净化过程中测量温度，以确保呼吸器温度能够维持在100℃50分钟。

更新日期：2020-09-08

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