CMV 的 Sat-RNA 是一种亚病毒剂，取决于其辅助病毒的复制和细胞间的扩散。
Sat-RNA of CMV is a subviral agent, which depends on its helper virus to replicate and cell to cell diffuse.
这样一来，细胞内部发生的使得核酶加速核酸复制速率的任何变化，都会在进化群体中快速扩散。
Thus, any random changes in the interior, fledgling ribozymes that could speed up nucleic acid replication rates will spread rapidly through an evolving population.
病原体必须逃过宿主免疫系统的重重防御，直至能够在宿主细胞内复制及扩散到其它细胞中，才算侵染成功。
To be successful, a pathogen must escape the many defenses of the host immune system until it can replicate and spread to another host.
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