It's in the soil, and the bird poo makes the soil the right ph for the fungus to grow.....the spores are then released and if one is in a situation where this is available, one will most likely contract it.
Apparently birds don't actually carry it....it's their wonderful poo that is the "fertiliser" for the specific fungus (forget the name).
Bats, on the other hand, can contract it by breathing it in.....but they also carry it and can spread it through their poo.....so, it is contagious that way.
Apparently, it's not spread via humans.....seems a good thing.
One article I read stated that asymptomatic people don't need to be treated, but those who are immunocompromised, regardless of whether they're asymptomatic, should be treated.
I just suggest you do the research...lots of it....and be ready for your appointment. Not all doctors may have the same philosophy about treatment, etc.
Keep us posted,