A. When used in health care, the N95 designation means the respirator blocks at least 95% of very small particles in the air that are transmitted by coughs, sneezes or during some medical procedures. The CDC does not recommend these types of masks for the public.

Czech Republic China Outbreak

Daniela Jandova project manager of Pardam nanotechnology company demonstrates a respirator at their factory in Roudnice nad Labem, Czech Republic, Wednesday, Jan. 29, 2020. The respirator that uses a layer of nanofibers effectively filters out viruses and bacteria, according to the company. (AP Photo/Petr David Josek)

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