COVID-19 Outbreak Information Updates (Reboot) [over 150.000,000 US cases (est.), 6,422,520 US hospitilizations, 1,148,691 US deaths.]

DaveXA said
I'd say all of the above.

As a scientist of sorts, I'd say we can't specify, only speculate, or get more granular data. Ethically, you can't run the type of controlled test to adequately measure it.