In my understanding, it is not all viruses become less deadly over time.
Rather a virus mutates in an animal, then it has a mutation that humans can catch, that first iteration will be most deadly, then become more contagious and less deadly as it spreads around.
Not all viruses are of the same lineage in that sense.
In my understanding, it is not all viruses become less deadly over time.
Rather a virus mutates in an animal, then it has a mutation that humans can catch, that first iteration will be most deadly, then become more contagious and less deadly as it spreads around.
Not all viruses are of the same lineage in that sense.
HIV did.