Yes. These : Plus HEPA and ventilation.
RT @BarryHunt008: @BogochIsaac Masks can stop flu, pertussis, and RSV, and can reduce Covid significantly.

It's important to be honest about what masks can do at the population level and what they have already done.

Respirators could stop waves completely.

#WearARespirator

🐦🔗: https://n.respublicae.eu/NChildersMEP/status/1617615063787114497