Mask effectiveness studies.
From Loeb M, Dafoe N, Mahony J, John M, Sarabia A, Glavin V, Webby R, Smieja M, Earn DJ, Chong S, Webb A, Walter SD. Surgical mask vs N95 respirator…
600,000 masks from China do not work.
600,000 masks delivered to Netherlands from China do not work, and many are already in use. https://twitter.com/MacaesBruno/status/1243987243812913152?s=20