本文报告四川石渠县牦牛、绵羊自然感染多房棘球蚴。牦牛的感染率6.7％,绵羊7.7％,对9例标本的观察表明,多房棘球蚴在家畜肝脏发育不良,没有育囊与原头节。其大体形态与组织病理改变与人肝多房棘球蚴相似。 This paper reports that Sichuan Shiqu County yaks and sheep naturally infected with Echinococcosis. The infection rate of yak was 6.7% and that of sheep was 7.7%. The observation of 9 specimens showed that Echinococcus multilocularis was stunted in the liver of livestock and there was no cyst and protuberance. Its general morphology and histopathology were similar to those of human hepatic multiloculare.