At the end of October I had to put a pullet down who tested positive for Marek's disease. My flock has been asymptomatic until just this week. My rooster has the yellow eye on one side. No other symptoms and he is going about his daily activiites without a problem. I started giving him mutlivitamins via syringe. What should I expect? Will he decline or will he just have a discolored eye? Also is there anything else I can do to help him?