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    • Virus image
    Rights: Public domain Published 18 October 2010 Size: 27 KB Referencing Hub media

    Viruses are microorganisms that are so basic they are not even classified as living. Viruses are just genetic material (DNA or RNA) wrapped up inside a strong ‘coat’ made of protein.

    Courtesy of the Centers for Disease Control and Prevention's Public Health Image Library

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      Microorganisms – friend or foe?

      We can’t see them. We can’t hear them or feel them, but they are with us. There are 10 trillion (10 x 1,000,000,000,000 or a million million) cells in the average body. For every cell, we have 10 ...

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