I am very sorry for your experience. I always find your results interesting. I grow other plants, indoors and outside, live in a town surrounded by farms, have dogs that brush against the outside plants, and buy orchids (and the other plants) from a variety of places so I have long ago realized that a virus-free collection is probably not going to be possible for me. Worse, a biologist once told me that the only way to guarantee beyond doubt that a plant is completely free of virus is to run every part of the plant under an electron microscope...very impractical.
Human virus antigen tests, the ones that are often sold for home use or used as a first indicator in other settings, do sometimes yield false positives (enough so that a second test is often recommended after a positive result for some viruses). I imagine that false positives can happen in plants just as it does with tests for humans.
Years ago, when I first began growing orchids, it was commonly recommended that if one got a positive result, to then send samples off to lab (or, believe it or not, a university) to have the virus confirmed.
In those days, for the scientifically inclined who were also cheap, an alternative was to use 'indicator plants' to test virus in orchids...you would wound the 'indicator plant' and put a little of the sap of the suspect plant in the wound. If your orchid was virused, the 'indicator plant' would quickly show signs of the virus. These plants are now resistant to virus so they no longer can be used for this purpose, interestingly enough.
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