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The COVID 19 (also named as 2019 nCoV) is a very contagious novel coronavirus. Though most patients contracted the 2019 nCoV will likely have mild symptoms with good prognosis, some will develop severe acute respiratory infection, pneumonia, or acute respiratory distress syndrome. Some of these patients will need anesthesia care for endotracheal intubation, critical care management and

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The 3M Particulate Respirator (Model 9032 KN90) was selected for the workers as it provided good filtration performance with 90% efficiency against non oil particulates. It is hypothesized that only 10% particulates and total gas were absorbed by air inhalation under the circumstance of wearing a facemask.

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But it still irks me that any expert out there could totally disregard every NIOSH and N95 report, not to mention Chinas own standards, as well as Europes. All of them test masks for particulate matter and all can objectively rate masks. How can anyone rationally say masks dont work against PM2.5?

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