Th e primary cyst wall of S.cruzi was folded into finger-like protrusions,whic h never contained fibrils and dense granules.

• 枯氏住肉孢子虫超微结构的特点是，原囊壁向表面突出形成倒伏的指形突起，突起内无纤丝、微管和致密颗粒。