More than likely any tree you have has the virus, even if it shows no symptoms. Any tree you purchase from any nursery source will be similarly infected. I have gotten trees from virtually every nursery in the US that sells fig trees, and they all have FMV. That is the reality. Ag inspectors don't even care about it because it is considered ubiquitous and not an issue. If it is an issue for you, keep tree you have and do not acquire any more.