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.
Even if you were already vaccinated, your body sees the virus and makes more of whatever it needs to in order to kill it when it finds it. Then your body will keep more of that antibody around for the future because it … happened again.
Same thing happens without a vaccine