The only thing we know for sure about this virus is that if people catch it they might die, and various people are at higher risk. Everything else is still up

The only thing we know for sure about this virus is that if people catch it they might die, and various people are at higher risk. Everything else is still up in the air. We have to buy time, time to find effective antivirals (work in progress), time to get an effective vaccine (work in progress), time to understand the virus enough to know even such a simple thing as how long somebody who's had it and recovered might be immune for. That one critical number you have to know in order to know if a plan like the herd immunity idea is even remotely feasible, that one critical number that NOBODY KNOWS. Isolation is, from everything I've read, the only strategy currently supported by the available evidence. Maybe in six months we'll have data that says herd immunity would have worked, but we really don't know right now.