From my understanding "FMV" is kind of an all encompassing term for pathogens that affect leaf and plant development (many are indeed viral). I think most transmission occurs via insect vector, which some regions have, and others do not. Honestly, I wouldn't worry about it. Obviously try to get plants from non-UCD sources if you're that worried about it, but living it CA (which I think has some of the insects that transfer it), you'll be lucky to keep it from spreading.
Overall, don't worry about it. If we figure out how to eradicate it, then maybe that's a different story. But until then, just keep on collectin'