mask efficacy

That's a good question. Masks remain one of the non-pharmaceutical means of controlling the spread of infection. But how effective has COVID masking been in practice?
Virus particles come from people, like you and me, when we are ill, even before we are symptomatic. While the necessity for masks for this pandemic may be ending, barrier face coverings (BFC) may, in the future, reduce exposure to particles of concern - other viruses. Here is the work of my organization.