. Diseases of cattle, sheep, goats and swine. Veterinary medicine. TKICHINIASIS—TRICHINOSIS. 85 this girl had some time previously eaten a quantity of raw ham. Virchow and Leuclcart returned to their investigations, and the life liistory of the parasite soon hecaine definitely known. Causation. Trichinosis is capable of attacking all mammifers with- out exception, from a man to a mouse; and most animals which can be made the subjects of experiment contract the disease in varying degrees. The intestinal form is seen in l)irds, but the muscles do not become infested by the embryos. Cold-blooded
. Diseases of cattle, sheep, goats and swine. Veterinary medicine. TKICHINIASIS—TRICHINOSIS. 85 this girl had some time previously eaten a quantity of raw ham. Virchow and Leuclcart returned to their investigations, and the life liistory of the parasite soon hecaine definitely known. Causation. Trichinosis is capable of attacking all mammifers with- out exception, from a man to a mouse; and most animals which can be made the subjects of experiment contract the disease in varying degrees. The intestinal form is seen in l)irds, but the muscles do not become infested by the embryos. Cold-blooded animals are proof against the disease. After the ingestion of meat containing cysts of the parasite, the processes of gastric and intestinal digestion set the larvse at liberty. These larvae become sexual at the end of four to five days, and the females, which are usually twice as numerous as the males, begin laying eggs from the sixth day, continuing for a month to six weeks. Each female lays approximately from 10,000 to 15,000 eggs. The embryos perforate the intestinal walls, pass into the circulation, and are hurried into all parts of the system. This period of infes- tation constitutes the first phase of the disease. Askanazy, in 1896, suggested that it was not the embryos which perforated the intes- tinal walls and thus reached the blood-vessels, but the fertilised female trichinae themselves, which entered the terminal chyle vessels and laid their eggs directly within them. This observation is of great interest, for it contradicts the view held by Leuckart and proves that treatment is useless even in the first phase. The males are about J^ inch in length, the females J inch to .jV inch, and are ovoviviparous. Symptoms. The symptoms lack precise character, even when the disease is known to be developing, and moreover they have only been carefully observed in experimental cases. As soon as the laying period begins, signs of intestinal disturbance may be observed, possibly
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