The exposure network hasn't been trimmed to zero, but its branching factor has been radically cut down. This is going to have an effect.

You're kidding right? Under what conditions that things are fine are you preposing? If you're not taking this serious, and in the US, you're definitely part of the problem. That attitude, statistics aside, is going to get people killed.

Among the things you should have derived from reading more carefully is the fact that state I'm living in is taking it quite seriously. Personally, my hatches are battened down and I'm prepared to be isolated for at least a month, maybe two. (Have to admit it's hard to tell how far my supplies will go, I've never actually had to live on them before.)

You're talking to someone who specially prepped for this about seven weeks ago, in addition to the general prep I already had on hand. If you can match that, then maybe consider start lecturing me. I actually got a bit of flak from my wife for the amount of prepping I did, because it was before she'd hardly even heard there was a new virus. Now she's glad I did, because I bought all the things that are missing in the stores around here now long before it was "hoarding".

I'm in the top tier of taking it seriously. At the same time... Don't panic. Don't advise panic. Don't fall into the cognitive trap of modeling this as a zombie apocolypse or some other thing where the virus is intelligently seeking out victims. Isolation measures will slow the virus down. It isn't possible to keep it "out of the US" but it remains possible to keep it out of your county, or your city, or your neighborhood, with sufficient steps. Total doom is not yet inevitable, and even then, how you are impacted remains significantly under your control even if your government is feckless. Or, at least, it was, if you got your prep in before the panic rush... you may be a bit more at the mercies of your government now.