When people eat raw or incompletely cooked pork containing cysticerci , the cysticerci are stimulated by the bile in the alimentary canal and retract their heads so as to hook onto the intestinal mucosa . proglottids segments grow continuously from their necks and form adult worms in two to three months . usually , there is one adult worm in the human body , but there may also be several of them 人们生食或摄食污染熟食或未煮透的含囊尾蚴的猪肉时，含囊尾蚴在消化道内受到胆汁的刺激，头节翻出，固着在肠粘膜，从颈部不断长出节片，约经二到三个月，发育为成虫，人体内通常寄生一条成虫，也可寄生数条。
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