yeah, mycotoxins (ie: toxic byproducts from fungi/mold decomposing your food stuffs) don’t always get broken down during cooking. So, while cooking according to standard food safety specs may have killed the mold, their shit is still everywhere ready to fuck your shit up.

Not to mention that you have to survive an infection before it matters that you immune system learned to detect the infectious agent. Yes, the first inoculation techniques were literally just minor exposure to the infectious agent (eg: grinding smallpox scabs and blowing the resulting powder up the nose – wtf). While it technically worked, the mortality rate was still pretty damn high, just not quite as high as ya know getting smallpox the normal way, and thus really only used when a serious outbreak was occuring. We’ve gotten so much better at making vaccination safer and more effective, because we now know so much more about what is actually occuring biologically and know to use attenuated virus or just the benign protein coat alone to achieve results. Why would you ever want to go back to scab-snorting (or toilet licking, apparently, lol)?