Sheep schistosomiasis is schistosomes parasitized in the portal vein, mesenteric vein and pelvic vein of sheep, causing anemia, wasting and nutritional disorders of a disease. Symptoms: sheep suffering from this disease is mostly chronic, only when suddenly infected with a large number of tailed larvae, acute onset. The sick sheep show elevated body temperature, flu-like symptoms, loss of appetite, mental instability, shortness of breath, plasma nasal fluid, dysentery, emaciation, etc., often resulting in a large number of deaths. Once tolerated, it becomes chronic. Mildly infected sheep lack acute manifestations. Chronic cases usually present with pale mucous membranes, edema of the jaws and underbelly, increased abdominal circumference, indigestion, soft stools or dysentery. Young sheep have stagnant growth and development, or even die. Ewes do not come into heat, infertility or abortion.