The latest on mask effectiveness came out about 3 weeks ago from the CATO Institute:
Summary:
"Of 16 randomized controlled trials comparing mask effectiveness to controls with no masks, 14 failed to find a statistically significant benefit, the researchers said. And of 16 quantitative meta-analyses, half showed weak evidence of mask effectiveness while the others were “were equivocal or critical as to whether evidence supports a public recommendation of masks,” they added.
“The biggest takeaway is that more than 100 years of attempts to prove that masks are beneficial has produced a large volume of mostly low-quality evidence that has generally failed to demonstrate their value in most settings,” Dr. Jonathan Darrow, an assistant professor of medicine at Harvard Medical School."
Here's the working paper for everyone's review: https://tinyurl.com/y2qgm63f
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