牛脑包虫病是由多头绦虫的幼虫期——多头蚴引起,成虫寄生在狼、狗等肉食动物的小肠内,幼虫寄生在绵羊、山羊、马、牛等脑和脊髓内,两岁以内的犊牛最易感染,由于寄生部位,包囊大小不同,对脑神经 Echinococcosis is caused by the larval stage of the tapeworm - Polyciferae larvae. Adults are parasitic in the small intestine of predators such as wolves and dogs. The larvae are parasitic in the brain and spinal cord of sheep, goats, horses and cattle, and are within two years of age The most vulnerable to infection of calves, due to parasitic sites, cysts of different sizes, on the brain