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COVID-19: Distancing Works, N95 Respirators Work Better
https://www.medscape.com/viewarticle/931551?faf=1&src=soc_fb_200612_mscpmrk_oustop5_int_ca_lapsed
Optimizing the use of masks and respirators during the COVID-19 outbreak
The FDA consider KN95 respirators medical devices equivalent to N95s https://www.canada.ca/en/health-canada/services/drugs-health-products/medical-devices/masks-respirators-covid19/health-professionals.html#a34