Herd immunity seems to be only option, but how to achieve it?
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"In what may be the world’s most important math puzzle, researchers are trying to figure out how many people in a community must be immune before the coronavirus fades."
If herd immunity occurs at 20%, many areas, like NYC, are already there. If herd immunity occurs at 40%, it should be possible to isolate the vulnerable healthy population until it occurs for everyone else.
It's still unknown how many people have/had the virus, or how long immunity lasts - also critical to know when planning for a vaccine.