There were sparse mitochondria and endoplasmia reticulum, and many vacuoles in cytoplasm, coalescence of microvilli on the cell surface, cellular materials discharged.

• 超微形态结构发生显著变化表现在胞内细胞器数量减少，出现大量空腔，细胞表面微绒毛联合、变大，内容物外倾。