I am sure it is cultural, not viral. Looks like cold damage to me.
But patience will be necessary ; I have an awarded plant of Paph Susan Booth which got badly frosted in 1996 I think it was, but three or four smallish growths survived, and I have been growing it on ever since, expecting and hoping that it will get back to flowering condition, but it has not made it yet.
How long should I carry on the struggle ? Maybe I'll I'll give it another few years... but if I happen to see the same thing on offer, I shall buy and quietly dump this one. The point is that the plant is ( at present) irreplacable.
If it were just another hybrid I would have recycled it on the compost heap years ago ( not that orchids do recycle ) I can dig out the garden compost heap after a couple of years and find orchid plants which don't seem to have even started to decompose !