Science Trek

D4K: Viruses

Special | 28m 48s

Viruses are basically little glops of chemicals that use other organisms to make copies of themselves. They can hang around for years without doing anything at all, until the right host comes along. That’s when you can get sick. Find out more. Experts answer students’ questions about viruses.

Aired: 11/21/06

Rating: TV-G

Video has closed captioning.

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