Okay, so various things.
Any species has to keep mutating in order to stay up with the competition.
Variations in things like virus can be in competition with each other.
Killing the host is not advantageous to a virus, it needs the host to reproduce.
Being highly contagious and symptom free is highly advantageous.
We do not know why, but we do know that covid is often symptom free, it is also highly contagious, would it be possible to develop a form which was always symptom free and then provide the conditions for widespread infection and transmission, aerosols in public places, you know. Would that a. dominate the other varieties, or b. give people immunity to other variants, rather than vaccinating them, infect them.
Hmm. there could be a plot there.
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