I mean common cold has been around for a long time. How has the immune system not learned how to fight it?
In: Biology
If you want a recent example of how absolutely awful humans are at basic hygiene in the face of a single pathogen, just look at Covid. People massively overestimate the safety and effectiveness of their habits even in the face of a virus we have a vaccine to. People are forced to care more about their income for a single day than public health. All a virus has to do is mutate and not be deadly enough to kill off the host species (or make us care enough to eradicate it) and it’ll stick around.
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