Coccidiosis - E. tenella

Eimeria tenella: infection is usually limited to the caeca. The condition occurs most commonly in young chickens.

The caeca are distended by blood.

Eimeria tenella: caeca distended with blood.

Eimeria tenella: Severe hemorragic enteritis. Erosions of the caeca mucosa.

Gross pathology reveals marked bilateral distension of the ceca, characteristic of severe cecal coccidiosis (Eimeria tenella). The serosal surface exhibits extensive petechial to ecchymotic hemorrhages, accompanied by wall thickening. On incision, the cecal lumen is filled with copious frank blood and dark hemorrhagic, core-like exudate, consistent with acute necro-hemorrhagic typhlitis.

Severe acute necrohemorrhagic typhlitis consistent with Eimeria tenella infection. The caeca are markedly distended with thickened, dark-purple to mottled serosal surfaces showing multifocal to coalescing petechiae and ecchymoses. 

Bloody droppings due to E. tenella in young pullets.