I had three silkies die recently. Shipped them off to get necropsy because everything pointed to Marek's Virus. Thank the Lord that I finally got some results: COCCIDIOSIS- Eimeria Necatirx.Treatable with Amprolioum and preventable for future up bringing. So thankful. :) Wish I would have done this sooner, 11 birds die since November 2015 (7 month period). Effected 26% of my flock. Fingers crossed this will take care of all the issues I have been experiencing.