Cattleya suspicion of a virus

[KatKate]

Finally after some observation time, the streaks got worse and I decided (sadly) to eliminate the plant from my collection.
I do not want to develop paranoia following this issue, however I noticed a couple of my plants that were in the same area as this potentially infected plant, but were not in direct contact have some chlorotic signs on new leaves/growth. I am wondering if it were a virus, whether it can develop the signs this quickly or whether I am just overreacting and these might be just particularities of the plants/nutritional issues and nothing to worry about. Attaching the photos of my Dendrobium nobile and Brassocattleya. Thank you very much in advance for your input.

[Roberta]

That definitely does not look like virus. Those lighter areas look like no big issue at all. Relax and enjoy your orchids. Grow them for the flowers, don't stress over a few imperfections on the leaves. Just for reference since you have already disposed of the Catt, the main sign on Catts that raises a red flag for me is color break on the flowers. That can be due to mechanical or insect issues, but it's also a big virus symptom. Streaks and spots on leaves have lots of causes, virus is not high on the list.

Still, the only sure way of identifying virus is by testing. A biochemist with a specialty in molecular genetics who is a member of one of my orchid clubs has done considerable work on the topic of orchid virus. He devised a little test with photos of plants and flowers (tested, so he knew which were and which weren't), that he presented to a number of very knowledgeable people - experienced growers, some of them orchid judges... the task, to identify the virused plants. This expert group did no better than chance on the identifications, positive and negative. (Results that would be expected by flipping a coin or rolling dice)