Your lilies are OK! When you see a regular pattern like that, it is due to mineral deficiency. Virus had an irregular pattern.
How is your pH? I have this problem with lilies that I have growing along my gravel driveway where the pH is between 8-9. Epsom salts helps in the short term, and in my case I've had to work a considerable amount of elemental sulphur in to the soil.
