The flu, cold sores, chicken pox - all these ailments, and plenty more, are caused by viruses. But what, exactly, is a virus, and how does it make you sick? In this BrainPOP movie on viruses, Tim and Moby explain how these tiny particles hijack your body’s cells, reproducing copies of themselves and giving you an infection. You’ll learn about the physical makeup of a virus, how viruses spread from one person to another, and some of the sicknesses caused by viruses - from simple ones like the common cold to life-threatening ones like Ebola. You’ll even find out about harmless viruses, which simply replicate and then move on!