So that's why they have been wearing them in operating theatres for how long?At best all face coverings will do is delay transmission within society.
You mean survival of the fittest? No more to say about that attitude.This brings up the question of delay now means more infections later on into real winter weather in the Northern Hemisphere countries. This could have more more serious consequences by allowing Covid-19 infections and seasonal pathogens like flu/ influenza to rise up just when they are their most deadly. In winter.
The only solution is Community Transmission also known as Herd Immunity. Protect the at risk groups (if they wish to be protected) and let everyone else get on with life. Become infected, have mild symptoms if you are unlucky and achieve herd immunity.
Polio, measles, dipthiria (sp) didn't work with themA vaccine is no different to Community Transmission/ Herd Immunity it is an just artificially induced means to immunity.