All right, all right. Be easier to Instacart you some Doritos, Dan. than type this out on twitter but shame away. Let's make some wild guesses. Maybe 1x10^-7 Da per particle? Any virologists want to argue that one? I'm not at all confident because there's so much we don't know.

Then, as Sam said, you have to remember the difference between infectious particles (which we measure) and total viral mass, which is probably 10-1000 times as large depending on the virus.

Then you need to figure out all the reservoirs. Bats, definitely. Cats, almost certainly. Other animals, who knows? And of course there's humans especially those who went to Sturges etc.