PMC7111123_01
Subserosal edema along lesser curvature of rumen, with serosal ecchymoses and congestion in rumen wall.
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PMC7111123_01_gr1.jpg
fig1
At necropsy, the calf had a distended rumen and abomasum, and the contents were a mixture of clotted milk and bloody fluid (Fig. 1 ).
Hemorrhage and emphysema in duodenum, with serosal ecchymoses.
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PMC7111123_01_gr2.jpg
fig2
The duodenum 15 cm distal to the pyloris was hemorrhagic and emphysematous (Fig. 2 ), and the intestine contained blood-tinged fluid (Fig. 3 ).
Gram-positive rods associated with the duodenal mucosal surface.
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PMC7111123_01_gr4.jpg
fig4
Many large bacterial rods, which were morphologically compatible with clostridia, were found in the gut lumen and associated with the mucosal surface (Fig. 4 ).