COVID-19 Outbreak (Update: More than 2.9M cases and 132,313 deaths in US)

Meta analysis of mask effectiveness. Didn't appear to help much against viruses. From 2017 but very robust.

https://academic.oup.com/cid/article/65/11/1934/4068747
"There was no significant difference between N95 respirators and medical masks in protecting HCWs from SARS (OR = 0.86; 95% CI: 0.22–3.33), with corresponding RRs of 0.88 (95% CI: 0.26–2.27) and 0.94 (95% CI: 0.41–1.34) under baseline risks of 20% and 60%, respectively..."

If this is what they found do we really expect homemade cloth masks to be better?

This is still prevention from getting sick and not the other way around though.