Lots of fungi and bacteria that aren't human pathogens can nonetheless infect us if they somehow get past our skin. Since they haven't evolved an equilibrium t

Lots of fungi and bacteria that aren't human pathogens can nonetheless infect us if they somehow get past our skin. Since they haven't evolved an equilibrium to maximize spread these are some of the deadliest diseases out there - or were until we learned to control them with drugs. https://aeon.co/essays/when-bacteria-kill-us-it-s-more-accident-than-assassination https://aeon.co/essays/when-bacteria-kill-us-it-s-more-accid... We tend to think of the adaptive immune system, antibodies and such, as what protects us from disease. But it isn't nearly important as the automatic immune system that quickly dispatches most potential pathogens that find their way into our body without any period of learning. And that isn't as important as the barriers like skin and mucus that prevent all the critters of the world from getting into us in the first place.