I have yet to understand why so many viruses or bacteria haven't evolved to be harmless (specifically, I don't know of any harmless virus). I think it would be greatly beneficial for a virus to control his population and use natural transfer channels that dont cause discomfort(like feces), since it would be allowed to stay in an organism indefinitely and would have a lifetime channel for transmission, hopefully getting to be the most common strain.
So, why have viruses not evolved to be harmless to their hosts?
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