@grannyj smith look up Paul stamets and his work into fungi and how it can be used in helping humans fight off both viral and bacterial infections including those that are fully antibiotic resistant.
I and my tribe all use the stuff, I have only ever gotten not feeling good never sicken over 6 years using stamets products. I volenteer at ambulance service so get some exposure to nasty nasty stuff.more than a few msra and worse cases for hours drive to main hospital 200 miles away touching and sitting next to them for whole trip. I would say after that long being sick try the extracts which is what we use, it defiantly won’t harm.