Interesting, my model of a pathogen (mostly shaped by my biology teacher), was one of a symbiont not completely adapted to the host body (yet). This was decades

Interesting, my model of a pathogen (mostly shaped by my biology teacher), was one of a symbiont not completely adapted to the host body (yet). This was decades ago, but when I later read up on the microbiome, the image of an alien infestation did not really cross my mind. What caused me more concern was the (halfway) realization that this symbiosis goes as far a actually forming the human body.