If reproduction of itself is why pathogens infect hosts, wouldn’t it be best for them to infect and keep the host alive rather than causing death? Do they just reproduce too much and kill the host without understanding that it would result in the host dying and themselves with it?
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IIRC the pathogens typically evolve to stay in a certain species with it staying alive. When it crosses into a different species with a less compatible immune system is when the death happens
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