鸭疫里默氏杆菌感染，纤维素性肝包膜炎和心包炎，北京鸭雏鸭

Gross pathology photograph of a duckling with skin, ribs, keel bone, and abdominal skeletal muscles reflected. Notice marked fibrin deposition along the capsular surfaces. The pericardium is diffusely thickened and lined by similar fibrin. This is a subacute lesion commonly found in natural infections with Riemerella anatipestifer. Cranial to top of image and caudal to bottom of image.