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Why are viruses generally pathogenic? You'd think they'd thrive even more if they didn't eg kill their hosts and that natural selection would favour high-spread, non-symptomatic viruses. Why aren't non-pathogenic viruses like eg AAV the default?

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Why are viruses generally pathogenic? You'd think they'd thrive even more if they didn't eg kill their hosts and that natural selection would favour high-spread, non-symptomatic viruses. Why aren't non-pathogenic viruses like eg AAV the default?	1