The life cycle of Taenia asiatica is complex. Eggs or gravid proglottids (bisexual reproductive segments) are passed with feces; the eggs can survive for days to months in the environment. Pigs (typically) become infected by ingesting vegetation contaminated with eggs or gravid proglottids. In the animal's intestine, the oncospheres hatch, invade the intestinal wall, and migrate to the striated muscles, where they develop into cysticerci. A cysticercus can survive for several years in the animal. Humans become infected by ingesting raw or undercooked infected meat. In the human intestine, the cysticercus develops over several months into an adult tapeworm, which can survive for years. The adult tapeworm attaches to the small intestine by its scolex and resides in the small intestine. The adults produce proglottids which mature, become gravid, detach from the tapeworm, and migrate to the anus or are passed in the stool (several per day). The eggs contained in the gravid proglottids are released after the proglottids are passed with the feces. (Centers for Disease Control Parasites and Health website)
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