yeah it's actually just mold harming the immune system which makes the immune system overworked and then sometimes it attacks it's own healthy cells. This is why years ago when someone was sick doctors recommended they move to arid climates. Less mold in the air there. Over in India recently they supposedly had a covid epidemic which is where the delta variant came from, it was actually just mucormycosis, a black fungus. My theory is that antibiotics is a big cause of this. Mold does kill bacteria but then you have mold in your body which over time slowly kills you.