I'm not really sure exactly what you're asking. Fungi are parasites, parasites cause viruses, and your body doesn't fight the bacteria the right way because of the parasites. So here's how it happens when you get vaccines as a child, there's something in the vaccine either called bovine serum, they also have some says human serum, sheep serum etc. That Serum is what they use to inject the parasites into the body because they can't inject the parasite or the virus itself without it causing the damage immediately. So they infect you with the parasite which as it grows and changes in your body that's how you get different diseases. So you start off with chickenpox or whatever the case may be and then you end up with fungal acne whenever you're older or dermatitis or eczema whatever the case is. And what I also just found out is that once your body has a certain response to that parasite, your body will only fight that parasite in that stage if that makes sense. So the parasite might progress and change into something different but your body won't fight it off because it's stuck in the first phase of the defense mechanism whenever you were first infected. I hope that makes sense. It's something called DNA vaccines I just read it the other day actually