Definition, Synonyms, History, Losses. Bacillus choleræ suis, 1.2–2μ., ærobic, biology, table of germs; accessory causes, roaming pigs, railways, car litter and manure, boats, trucks, loading banks, chutes, runways, stockyards, pens, fairs, watershed, butchers, dealers, etc., wagons, dogs, birds, vermin, insects, offal of abattoirs, butcher’s and kitchen scraps, unburied carcasses of dead hogs, convalescent and immune hogs, susceptibility, parasites and infection atria, putrid food, infection from ground carried into feeding trough by snout and feet, large herds, rapid carriage of swine for long distances. Lesions: hæmorrhagic spots and petechiæ on skin, mucosæ and serosæ, circumscribed capillary congestions, congestion of spleen, lymph glands, stomach, intestines, necrotic processes. Button-like ulcers on intestinal mucosæ. Incubation, 6 to 14 days. Symptoms: fulminant cases. Acute Cases: dulness, anorexia, recumbency on belly, weakness, paresis behind, thirst, tenderness of skin and abdomen, hyperthermia, easily blown, blush on skin, dark red spots and patches, enlarged inguinal glands, cutaneous exudate—greasy or drying black, bowels costive, later pultaceous and finally diarrhœaic, petechiæ on mucosæ, emaciation. Chronic Cases: symptoms more slight, but great loss of condition. Diagnosis: from swine erysipelas, swine plague, Widal test, table of differential symptoms. Prevention: expense of extinction prevents effective measures; removal of accessory causes, comfort, air, light, food, salt, powdered soaps, mouldy bread, cotton seed, space, green food, precautions against introduction of bacillus, special shipping provisions for fat hogs, exclusion of stock hogs from infected localities, precautions by purchasers. Immunization, Disinfection. Certificates. Extinction in herds and districts. Treatment: chronic cases, food, antiseptic medication, antithermics stimulants, tonics. Serum therapy, method, merits, demerits. _Definition._ A contagious bacteridian disease of swine, acute or subacute, and characterized by hyperthermia and other febrile disorders,—congestion, exudation, ecchymosis and necrotic ulceration of the intestinal mucosa and of that of the stomach and of other parts,—by a profuse foul, liquid diarrhœa, by enlargement of the lymph glands with congestion and blood extravasation,—by effaceable blotches, and petechiæ (ineffaceable) of the skin, snout and visible mucosæ, with a tendency to necrotic changes—less frequently by pulmonary congestions, and degeneration,—and by a high mortality.