About 500 infective larvae were obtained and a yearling worm-free sheep was infected in Beijing. About 35 days post infection, the sheep began to deposit eggs from the feces.

• 其后作者又在当地采集了多量马歇尔属线虫的雌虫,取其虫卵,培养为第三期幼虫,在北京给一只绵羊进行了人工感染,并再次获得新种雄虫一条,因而确认为马歇尔线虫属的一个新种。