Video Segment |01:19

Video Segment |01:19

Defines viruses as tiny particles that are not dead or alive. They use living cells to reproduce, are difficult to study, and can affect humans in many ways. Vaccines can protect humans from many dangerous viruses.

©2008 Visual Learning| CC| Grade(s)

Related Topics

  • cells
  • common cold
  • HIV
  • influenza
  • measles
  • microscopic life
  • organisms
  • smallpox
  • vaccines
  • virus

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