Viruses: Introduction to Viruses
Diseases caused by viruses are as potent as war and natural disaster. Deadly, universal and small, viruses are powerless outside a living cell. Viruses are highly selective.
http://videos.howstuffworks.com/hsw/11882-viruses-introduction-to-viruses-video.htm
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The Microscopic World: Viruses
Viruses -- which are smaller than bacteria -- cause diseases such as AIDS and influenza, but are not considered to be living. They are protein-wrapped packets of DNA or RNA, and use a host cell to replicate.
http://videos.howstuffworks.com/hsw/10453-the-microscopic-world-viruses-video.htm
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Viruses: How Viruses Work
This video explains exactly how viruses invade our bodies and what they really look like.
http://videos.howstuffworks.com/hsw/8061-viruses-how-viruses-work-video.htm
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Viruses: Mutations in Viruses
When viruses mutate, they stand up to antibodies and become dangerous.
http://videos.howstuffworks.com/hsw/8065-viruses-mutations-in-viruses-video.htm
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