Description:
Amblyomma variegatum ticks feeding on a goat.

Description:
Goat. The neck is extended, consistent with dyspnea.

Description:
Goat, thoracic viscera. There are many pleural hemorrhages, and the lung is moderately noncollapsed (edema).

Description:
Sheep, lung. There is severe interlobular edema.

Description:
Sheep, lung. Interlobular septa are distended with edema fluid.

Description:
Sheep, lung. The lung is noncollapsed and hyperemic, and the bronchi contain frothy fluid (pulmonary edema).

Description:
Goat, heart. There are many small hemorrhages on the endocardial surface.

Description:
Sheep, kidney. There are multiple petechiae on the cortical surface.

Description:
Sheep, kidney. Section reveals numerous fine linear radial hemorrhages; hemorrhages coalesce in the papillae on the right.

Description:
Goat, prescapular lymph node. There are multiple barely discernible petechiae in the cortex.

Description:
Goat, abomasum. There are multiple petechial and paintbrush serosal hemorrhages.

Description:
Small ruminant, abomasum. The mucosa contains disseminated petechiae and coalescing ecchymotic hemorrhages.

Description:
Small ruminant, small intestine. The mucosa contains numerous petechiae and ecchymoses.

Description:
Sheep, brain. The leptomeninges are congested and contain many small hemorrhages. Gyri are flattened (cerebral edema).

Description:
Goat, brain. Section of the cerebrum reveals multiple petechiae and a few ecchymoses. The choroid plexus is severely enlarged due to acute inflammation and hemorrhage, and protrudes from the lateral ventricle.

Description:
Goat, brain smear. An endothelial cell contains a morula (cluster) of Ehrlichia ruminantium.

Description:
Goat, peripheral blood smear. A neutrophil contains a few Ehrlichia ruminantium.

Description:
Goat, buffy coat smear. Several neutrophils contain E. ruminantium morulae.