Many envelopes observed by us have the shape of one end sharp and the other expensive,while the nucleocapsid is eccentr ic.OB consists of paracrystalline arrays of proteins.

• 根据细胞超微结构的改变程度及核中病毒发生基质和包涵体出现的情况，病毒的致病过程大致可分成三个阶段。