Fungus Among Us: High Ochratoxin A Found in People with Parkinsonism

A common mycotoxin, ochratoxin A, has been shown to kill dopaminergic neurons and cause clinical symptoms of Parkinson's in rodents. We tested humans with Parkinson's and they seem to be abnormally elevated.
Where is it coming from? What does it mean? What can we do about it? Will it matter?