re: Coronavirus Disease 2019 (COVID-19) ***W.H.O. DECLARES A GLOBAL PANDEMIC***

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if this is worse than we even know and we all die off

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If by "all" you mean all, then this is essentially an impossibility.

There are just too many of us and we are too spread out.

Even if immunity never develops, and multiple reinfections are possible until eventual death, there would surely still be many humans left after it burns itself out.

An organism that efficiently destroys its own means of reproduction will cause its own extinction.