Cystic dilatations with a watery content
Cystic oviduct with water-like fluid accumulation in commercial layer
Cystic oviduct in commercial layer
Inoculation at 9-11 days old of chicken embryos via allantoic sac.
"Curling" of embryos with a wry neck and feet deformed and compressed over the head.
Retardation of growth.
Infectious bronchitis in 4 weeks old broiler
Trachea of 4 weeks old broiler: Caseous cast. Tracheitis.
IB nephritis broiler chicken (4 weeks old)