There is no 'immune system". This is an unproven theory spun from the failed Germ Theory. Instead, the body has a healing system and a detoxing system.

https://bastyon.com/index?v=bac343db3b302344cefcf6bc61560814973306432fda96edd1716283c60b2f5e&video=1&ref=PUeEeTDxALRoAYPio7XuukS1ubsevz45Nz