Marek Disease in a chicken
Lucyin
CC BY-SA 4.0
<a href="//commons.wikimedia.org/wiki/File:Maladeye_Marek_pate_sitindowe_divant.jpg" title="File:Maladeye Marek pate sitindowe divant.jpg">File:Maladeye_Marek_pate_sitindowe_divant.jpg</a>