Does "cotton mouth" affect snails?

[Kabong]

One of my fish has cotten mouth, So ive treated the tank with fungus cure and salt now my trapdoor snail was in the tank and he seems to have the white fuzz on him as well. Will the fungus attach it self to a snail?

For the record the speed in which this fungus appears is startling. Before I went to work everyone looked fine. Come home and my mollies in a full blown outbreak of it.

 

[Blinky]

Look up columnaris (bacterial infection), I believe this is often what causes 'cotton mouth'. It looks like fungus, but it's really a bacteria, and it moves like lightning.
If this is what your fish have, you need to be as fast as you can about getting an appropriate medication in the tank (if Fungus Cure doesn't treat columnaris, it may, I'm not sure). Do diligent water changes while you're treating them; clean water will help the fish heal.
Fungus/bacteria can attack eggs, I don't see why they couldn't attack a snail (poor snail!) so if your snail's got the same type of growth on it, it's probably infected just like your fish.