Dust mask should do. Knock off the bark to get rid of the spores, that's where the fruiting bodies are. What you see are the "roots." It'd be pretty poor reproductive practice for an organism to hide its spores in wood, waiting for a turner to spread 'em.
Now, there are a bunch of toxins in that wood, where the fungus has been trying to defend its meal from competing bacteria and vice/versa. Been that way for billions of years. That's where we get antibiotics.
If you feel tightness in the chest or an itch, get thee some Benadryl, pronto!