Help!!! Virus epidemic???

[Connie Star]

I have about 60 orchids of different types. While doing monthly watering at the sink- I do weekly watering and fertilizing on the shelves, I noticed a couple of plants with slightly mottled leaves, then a Den with severe mottling and spotting that I am afraid it is a virus. Most of the ones that might be infected were together on one shelf in a humidity tray. I have the shelves set up so that no water flows from one to another. I'm very careful with hand-washing and rinse the trays with Physan periodically.