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Covid-19
In controlled studies, only somewhere between 20 and 40 percent of people were developed respiratory illness when a virus was placed in their nose. So exposure to a virus doesn't mean de facto that you will develop an illness. Different cultures have different sets of norms and practices that allow, that will slow or speed the spread. And so variation is very useful. Say COVID was much, much more destructive than it is. And like, I don't know, 20% of the population died. That's good to have variability because then at least some percent will survive.