Probably delivered by toy guns...
I have a place in the midwest that has some seven year old treated wood with protective stain that now has had 1 or 2% of the wood develop black fungus like the black fungus that eats out the inside of giant oaks.
It will eat a treated 2 x 6 in a matter of ten weeks. Killed everything with oxy-bleach tyoe mold and fungus killer but damn, that is nasty stuff.
Every article sounds like globull warming hysteria and not a one says anything like ... headaches, upset stomach green poop ....
All they say is it's contagious and it's in two states and it affects various parts of the body .... but there is no definition.