I love bellinas, and am trying to get the nerve back up to grow phals. I used to have mainly phals, but they did not like me, and I gave up. I think I might be ready for them again.
Hmm.. I don't know about a virus, but the streakig is pretty unusual. Perhaps others will be able to chime in here. I'm sorry that I can't be of further help... I can't seem to locate any info to help.
It's a very lovely plant, and I hope that it's nothing serious at all. I would get it tested just to be sure.