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国外早有报道,多种寄生线虫侵入宿主后,部分幼虫在其组织内存在延缓移行现象。近年来发现肌肉内延缓移行的钩虫于数百天后仍具活力,并可继续进入血循环发育,若幼虫转种给其它宿主,仍可受染。王懋博等报道一次性感染治愈后的钩虫患者,经一段时间粪便又发现钩虫卵,再经驱虫治疗虫卵阴转后粪检仍可复现阳性。如此反复达200余天,认为其与组织内迁延移行幼虫进入血循
Abroad has long been reported, a variety of parasitic nematodes invade the host, some larvae in their organizations there is a delay migration phenomenon. In recent years, it has been found that hookworms that delay intramuscular migration remain viable after several hundred days and can continue to develop into the blood circulation. If the larvae are transplanted to other hosts, they can still be infected. Wang Maobo and other reports of one-time infection cured hookworm patients, after a period of time and hookworm eggs found in feces, and then deworming treatment of eggs after feces negative conversion can still reproduce positive. So repeatedly for more than 200 days, that delay the migration of larvae within the organization and into the blood circulation