It might be virus, or it might not. Unfortunately, marks on leaves are not conclusive. Color break in flowers would be much more diffinative. You can have the plant tested if you want for about $5 to $6 dollars (Critter Creek Labs). However, don't panic over this. Any collection of 10 to 20 plants almost certainly as one or more plants that are virused. Just make sure you use sterile tools (not with alcohol), and don't allow insect infestations, especially aphids. If you want to see more pictures of virused plants for the fun of it, here is my collection of pictures:
http://www.pbase.com/schnitz/virus_in_orchids