Different masks protect against Covid-19, and its delta and lambda variants(qz.com)
qz.com
Different masks protect against Covid-19, and its delta and lambda variants
https://qz.com/2042410/how-effective-masks-are-against-the-delta-variant/
3 comments
No sources, that's how I like my medical information.
The title should be "How different masks protect against Covid-19, and its delta and lambda variants" but for some reason the "How" got auto-cutoff by the HN submission system for some reason...