That factor is called the secondary attack rate; I’ve seen values ranging from as low as 10% in one study (which has garnered a lot of scepticism) and in some larger studies, ~ 40%.
Preventing transmission in a shared space is very difficult. I can’t give specific estimates as to how much any of the measures you mentioned would reduce that likelihood, unfortunately.
That factor is called the secondary attack rate; I’ve seen values ranging from as low as 10% in one study (which has garnered a lot of scepticism) and in some larger studies, ~ 40%.
Preventing transmission in a shared space is very difficult. I can’t give specific estimates as to how much any of the measures you mentioned would reduce that likelihood, unfortunately.