The reason I ask is because our bodies as human beings have an amazing immune system and unless you have an autoimmune disease, naturally our bodies can heal ourselves from sickness.
I’m speaking primarily on the common cold, Influenza or anything similar like it, including even COVID.
I reject the premise. People have varying strengths of their immune system outside of autoimmune diseases, they’re not equal. One person’s natural ability to fight off a disease is not the same as another’s. Immune systems also can get overwhelmed. People can even get multiple viruses at the same time.
While scientifically, if I’m not mistaken, natural immunity tends to be a stronger form of immunity once the person survives a disease, surviving the disease is of course not a guarantee for anyone. Vaccination, when available, reduces the chance a person dies to a disease in the same way that warning somebody about something allows them to take preparatory action.
Prefer? Vaccination every time if available. I don’t like getting diseases my body has to scramble to fight.