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幼虫移行症 (Larva migrans)

幼虫移行症 (Larva migrans). 一些线虫的幼虫在侵入人体后不能进一步发育为成虫，但能在内脏中或皮肤下移行活动，造成机体不同程度的损害，这种现象称为幼虫移行症。 分为： 内脏幼虫移行症 (visceral larva migrans) （眼幼虫移行症 (ocular larva migrans) ） 皮肤幼虫移行症 (cutaneous larva migrans). 内脏幼虫移行症 (visceral larva migrans). 主要病原为：犬弓首线虫（犬蛔虫）、猫弓首线虫（猫蛔虫）、棘颚口线虫

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幼虫移行症 (Larva migrans)

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  1. 幼虫移行症 (Larva migrans) 一些线虫的幼虫在侵入人体后不能进一步发育为成虫，但能在内脏中或皮肤下移行活动，造成机体不同程度的损害，这种现象称为幼虫移行症。 分为： 内脏幼虫移行症(visceral larva migrans)（眼幼虫移行症(ocular larva migrans)） 皮肤幼虫移行症(cutaneous larva migrans)

  2. 内脏幼虫移行症(visceral larva migrans) • 主要病原为：犬弓首线虫（犬蛔虫）、猫弓首线虫（猫蛔虫）、棘颚口线虫 • 主要特征：嗜酸性粒细胞增高，肝肿大，急性肺炎等，根据寄生部位的不同而引起相应的症状。如进入脊髓和脑可引起脑脊髓炎，可致死亡。

  3. 皮肤幼虫移行症(cutaneous larva migrans) • 主要病原：巴西钩虫、犬钩虫、锡兰钩虫、棘颚口线虫 • 主要特征：皮肤出现匐行疹或间歇出现皮下游走性包块，皮肤发红、水肿，有灼热感、痒感。

  4. 粪类圆线虫 (Strongyloides stercoralis) • 是一种兼性寄生虫（有自生世代和寄生世代） • 寄生世代中，成虫寄生在宿主的小肠内，幼虫可侵入肺、脑、肝、肾等组织器官，引起粪类圆线虫病(strongyloidiasis) • 是一种机会致病性寄生虫，当机体免疫力下降或缺乏时，可致播散性超度感染

  5. 粪类圆线虫丝状蚴

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