Mushroom compost is all steam sterilized, AFAIK. Else the mushrooms would probably be overtaken by seeds sprouting from the manure.Considering what mushrooms are grown in, is it really a good idea to consume them fresh???
This refers to store bought buttons and others. Some, if not most edible wild mushrooms (like the golden chanterells that are in season here now) should be cooked because raw, they can cause stomach upset in some people.