There is no such thing as natural immunity, you are either immune or not, having antibodies in your systems just means you have been exposed to something that activated them, vaccine or not. Antibodies does not mean immunity, it just means protection. Consider antibodies like soldiers in an army, you need enough soldiers to combat an invasion. If the invading force overwhelms your soldiers they win and you start to deteriorate in health as the virus creates complications with your other body systems as it multiplies. The point of vaccination is to increase the solider force to the level it can combat a severe invasion from the onset, boosters maintain the level high enough. Vaccines do not fight along side your immune system, they just stimulate your immune system, like poking an ants nest, that is all.
Anyone can have some antibodies, but what has been proven is that you antigens wane over time and once you get below 50% protection you are at serious risk of major infection again.
Another thing to cover is that the more times you are reinfected the more likely hood of mutation to a resistant strain. Which is why flu keeps rearing its head. Same as a host of other viruses and disease that have now been almost eradicated through vaccination.
A number of the reinfected in Britain have antigens from previous infection, and it does show a lower severity of infection, but not consistent in protection. Pretty much everyone in Europe is carrying some antigens to covid now due to it's prevalence.
Last edited by 43Inches; 25th Sep 2021 at 06:18.