Your body doesn't. It's more microaganisms stay in their place, and don't travel to areas that can harm you. Bacteria on your skin is natural but is opportunistic ,if it enters a cut for example, it can cause infection. Even healthy gut bacteria are separated from your tissue via mucus layers.
TaiCookie t1_ivp3xvi wrote
Reply to How does our body's immune system distinguish between pathogenic microorganisms and commensal? by blue_sloth999
Your body doesn't. It's more microaganisms stay in their place, and don't travel to areas that can harm you. Bacteria on your skin is natural but is opportunistic ,if it enters a cut for example, it can cause infection. Even healthy gut bacteria are separated from your tissue via mucus layers.