Bovine leukosis
The incidence of this disease is especially high in Iwate Prefecture. Fever, anemia, swelling of the surface lymph nodes, decreased milk are observed before death. There are various types such as the enzootic adult type, calf type, thymus type, and the skin type. Autopsy findings are not uniform but include swelling and bleeding in the spleen, liver, kidneys, and lymph nodes and formation of nodules of various sizes localized in the heart, gastrointestinal walls, and the orbit.