A study outlining coronavirus measure 0.06-.14 microns and N-95 masks filter down to 0.3 microns. User MrMaxPowers247, in the No Agenda: In The Morning! subreddit, 07 Jan 2021
A study outlining coronavirus measure 0.06-.14 microns and N-95 masks filter down to 0.3 microns. User IDCimSTRONGERtnUinRL, in the Free-thinkers resisting the New Normal subreddit, 07 Jan 2021
A Novel Coronavirus from Patients with Pneumonia in China, 2019 | NEJM User kingfisher2018, in the r/Sciences - Science on Reddit subreddit, 29 Jan 2020