辅助病毒（helper virus）是指缺陷病毒与其它病毒共同感染细胞时，若其它病毒能弥补缺陷病毒不足，使之增殖出完整病毒的病毒。能为缺陷病毒提供所需要的条件，使缺陷病毒又能产生完整的子代病毒。
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.
被选中的寄主细胞是一种被叫做T细胞的免疫系统细胞，具体而言，他们是辅助T细胞[注一]，它将应答免疫系统对例如病毒等病原体的反应。
The host cells in question are immune-system cells called T-cells. Specifically, they are "helper" T-cells, which orchestrate the immune system's response to pathogens such as viruses.
老虎伍兹同意，适度的运动应作为其他预防措施的辅助方式来应对包括H1N1病毒的呼吸道病毒。这个病毒就是导致猪流感的病毒。
Woods agrees that moderate exercise should be viewed as an adjunct to other preventive measures against respiratory viruses, including the H1N1 virus that causes swine flu.
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