424 HOG CHOLERA 
Morbid anatomy. The acute type might with equal propriety be 
called the hemorrhagic or septicemic type, inasmuch as the chief and 
perhaps the only obvious changes are hemorrhagic in nature. They 
are more conspicuous when an animal is examined immediately after 
death. The hyperemia is first noticed in the lymphatic glands and 
the serous membranes. Later the cortex of the glands appears on 
section as a hemorrhagic line or band, according to the amount of 
extravasated blood, or the entire gland may be infiltrated with it. 
The glands most commonly hemorrhagic are those of the mesocolon, 
those at the root of the lungs, and on the posterior thoracic aorta. 
Besides these, the retro-peritoneal and the gastric glands may be 
Fic. 92. PETECHIAL HEMORRHAGES IN THE KIDNEY OF a PIG DEAD OF CHOLERA. 
involved. The mesenteric glands may show congestion or slight blood 
extravasations. Hemorrhages are also quite frequent beneath the 
serous surfaces of the abdomen and thorax. They are most abundant 
as petechiz and larger patches under the mucous membrane of the 
large and small intestines. They are occasionally found under the 
peritoneum near the kidneys, the diaphragm and the costal pleura, 
as ecchymoses or extravasations. The kidneys are usually the seat 
of petechiz. The glomeruli may appear as blood red points; larger 
extravasations may occur in the medullary substance and blood may 
collect around the apices of the papille. 
The more usual lesions are petechial hemorrhages in the cortex. 
They are also frequently present in the mucosa of the urinary bladder. 
The hemorrhages, according to Meyer, are due to a degeneration of the 
endothelium of the small blood vessels and capillaries brought about 
