I have always been a little leary of this practice as with the habit of "dunking" plants in a common bucket or tank. My thinking has been that this would be a mechanism for transfering virus (and other) problems.
Anything is possible if you're careless. Fungus & bacteria are generally transferred through water standing on leaves or in the crown, rarely in flowing water. The rules for orchid virus are basically the same as for AIDS, transmission through body fluids from an open wound or skin puncture, or unprotected sex (always have both prospective parents tested). Orchids in group plantings generally get their roots intertwined & possibly grafted, & virus is trnsmitted that way.
Iris
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