Moby's right. Those are typical shots of chlorosis, not virus. In fact, I have some bad cases here too, mostly on my martagons, and not on orientals. It all showed up severely after a couple days of 3 inches of rain (total). Since martagons are not so pH sensitive, I think it is due to fast growth and competition with calcium in temporarily waterlogged soil. They always will recover by themselves in time, but Epsom salt applied heavily to the soil does hasten the comeback. This time I am trying foliar application only at 1 tablespoon per gallon water.
Lilium martagon
Lilium tsingtauense/distichum cross
Lilium 'Nepara'
Lilium canadense