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Maybe the virus has evolved (through natural selection) to not to kill its hosts?

People who die from the virus usually infect many others before death. There isn't really any selection pressure for keeping the host alive.

Sure, but people who don't show symptoms can infect more! So in that case, the less potent one becomes more dominant, no?

Meanwhile those who show symptoms are more likely to stop infecting as soon as they're isolated.

That said, I'm not sure if there has been any different stands identified yet?