1. Its clinical manifestation is complicated, involves many organs and the incidence by turns is blood、derma、lung、heart、nervous system、gastrointestinal tract, eye, besides splenohepatomegalia is common.
   受侵几率从大到小依次为血液、皮肤、肺脏、心脏、神经系统、胃肠道和眼，常见肝、脾和淋巴结肿大。

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