I'm sorry you got a chick with Marek's. I'm glad you had her necropsied. How old was she?I would watch her closely and if you see classic Mariks symptoms, begin treatment immediately. Our first one was sick for a month and we thought it was heat related because whenever the temp went over 100, she would become weak, wouldn't eat or drink. I hand fed her, kept her cool, and in a few days she would be walking and eating better. Then she'd go downhill again. She became so weak finally that we asked the lab to euthanize her and do the necropsy. It was Marek's with tumors on internal organs and her bones. The second one didn't show any symptoms until 2 days before she died, but she was suddenly paralyzed. Necropsy showed the same internal tumors. So far the 3rd one is responding well to the SJW treatment so we're hopeful. Only time will tell, but I didn't expect her to be alive the morning after I started treatment as she was so weak. She is showing no symptoms right now, after 5 days of treatment, but if she does, I will begin treatment again.