This plant to plant comparison may help shed some light on what a difference in size, vigor and appearance a virus can make. These two lilies were growing in the same garden about 25 feet apart. This virus was detected early--it's first year. Had it gone undetected another year the devastating results would have been even more dramatic--and there's a good chance other lilies nearby would have been infected. Edit Added: The resistance level of a lily with a virus is greatly lowered, making it susceptible, especially to stressful situations such as hot, dry weather, cold winters, wet springs that usually result, then, in premature death.