Mixture of UV and airflow reducing density of infectious droplets, if it's anything like the pattern with TB. (Admittedly the susceptibility of COV-19 to UV seems to be less than that of TB. There's a reason that the Victorians had lots of consumption, what with heavy drapes on windows and an indoors lifestyle.)
Every difference behaviour can make with the current pathogen, other than strict isolation, is reducing rather than eliminating risk. Fir public health purposes that's frequently sufficient.
I am currently looking at the curves for the southern states, factoring in the fact that even prompt interventions will take a month or so to really show up in the numbers, noting that nobody really looks like making anything gesturing in the direction of sufficient interventions - have you looked at the politics in NC? - and expecting large-scale civil unrest south of the Mason-Dixin line fairly soon.
no subject
Every difference behaviour can make with the current pathogen, other than strict isolation, is reducing rather than eliminating risk. Fir public health purposes that's frequently sufficient.
I am currently looking at the curves for the southern states, factoring in the fact that even prompt interventions will take a month or so to really show up in the numbers, noting that nobody really looks like making anything gesturing in the direction of sufficient interventions - have you looked at the politics in NC? - and expecting large-scale civil unrest south of the Mason-Dixin line fairly soon.