The term swine-plague should not be used in speaking of outbreaks of hog-cholera, as it is now considered a form of hog-cholera involving especially the lungs. [Illustration: FIG. 81.--Kidneys from hog that died of acute hog-cholera.] [Illustration: FIG. 82.--Lungs from hog that died of acute hog-cholera.] LESIONS.--In _acute hog-cholera_ the inflammation is hemorrhagic in character. Small, red spots and blotches occur in different organs and tissues. In the _chronic form_ of the disease ulceration of the intestinal and gastric mucous membrane, inflammation of the lungs and pleura and sloughing of the skin are common lesions. _The skin_ over the under side of the neck, body and inside of the thighs may appear red or purplish-red in color. The different groups of _lymphatic glands_ are enlarged and softened. They may vary in color from a grayish-red to a deep red, depending on the degree of engorgement with blood. The pleura and pericardium may show small red spots and blotches. The _kidneys_ are usually lighter colored than normal, and marked with red spots and blotches (Fig. 81). The _spleen_ may show no evidence of disease. It may be large and soft, or even smaller than normal. The _liver_ may be enlarged and dark, or mottled and light colored. The _stomach_ and _intestines_ may show hemorrhagic spots and blotches. Sometimes the gastric and intestinal mucous membrane is a brick red. Ulceration of the mucous membrane is common (Fig. 83). [Illustration: FIG. 83.--A piece of intestine from a hog that died of chronic hog-cholera, showing appearance of intestinal ulcers.] Small, red spots may be present on the surface of the _lungs_ (Fig. 82). Scattered lung lobules or a large portion of the lungs may be inflamed. In chronic hog-cholera, pleural exudation, adhesions and abscesses in the lung tissue may occur. Inflammations of the pericardium and heart muscle are less common lesions. PREVENTIVE MEASURES.--Hog-cholera is the most widespread infectious disease of hogs, and all possible precautions against its distribution to healthy herds should be practised. Hogs coming from other herds and stock shows should be excluded from the home herd until they are positively shown to be free from disease. They should be quarantined in yards set off for this purpose. The hogs should be cleaned by dipping or washing them with a disinfectant. The quarantine period should be longer than the average period of incubation. Three weeks is sufficient.