Ultrastructural observation revealed degeneration of endothelial cells and neutrophils.The relationships among endothelial cell damage, cell infiltration and hemorrhage were discussed.

• 并推论内皮细胞之破坏与病毒上感染有关，而嗜中性白血球及红血球之外溢则与内皮细胞之病变有密切之关系存在。