Indeed, the veritable microcosm of non-human life all of us carry around on and inside of us. Also different levels of susceptibility. Breaching the skin alone

Indeed, the veritable microcosm of non-human life all of us carry around on and inside of us. Also different levels of susceptibility. Breaching the skin alone (aka surgery) introduces risks most of us don't have to worry about in our daily lives. And that's to say nothing of immunocompromised patients (e.g. cancer or transplant). What's a happy, harmless staph colony on my skin can be very serious for someone else.