C. albicans represents a large fraction of infections contracted in hospitals (IIRC second only to various staph infections). You come into contact with it all

C. albicans represents a large fraction of infections contracted in hospitals (IIRC second only to various staph infections). You come into contact with it all the time, without too much risk -- until your immune system is weakened, or it gets into somewhere that your immune system doesn't really contest that strongly.