Are there US orchid growers that guarantee virus free plants?

[SJF]

Hi,
In light of my getting virused orchids from three sources, I am wondering if there are vendors that guarantee clean orchids? I know it doesn't matter to some people, but it does matter to me. I practice clean practices so I don't cross contaminate, but insects can spread it if a plant comes home with them. I occassionally have fungus gnats. I read that thet can spread the virus. I don't want to lose my collection or take the time to care for plants that will decline and probably underperform