Tweet from j_g_allen at December 29, 2021 at 05:03AM
I see a lot of people – on both “sides” – making simple mistakes about masks. I’ve studied PPE, taught PPE, and overseen PPE programs, including teams implementing fit testing in hospitals, long before covid.
A thread
— Joseph Allen (@j_g_allen)
Dec 29, 2021
from http://twitter.com/j_g_allen