Virus structure

Helical Symmetry


Icosahedral Symmetry


Enveloped with helical nucleocapsid (influenza virus)

influenza-virionEnveloped with icosahedral nucleocapsid (herpesvirus)


Complex symmetry (poxvirus)


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  • how to get rid of a cold sore

    I had learned the structures of different viruses and its effect when I’m still on my high school days. We cannot predict if when these viruses do would attack. The main thing that we should do to avoid it is to have a healthy living.

  • Lung cancer Symptoms


    Brilliant post guys, Its really superb work guys, and your explaining style is too good.


  • Glory

    very nice and easily understood,thanks.

  • Soniamagsi5

    very informative.thnx it makes my study easier

  • Calizaga

    this page makes everything come together in a simpler form…. :)

  • Yekta

    Really thanks!

  • Dralihalepoto

    it was really helpful for me thanks!

  • Zulki Aliu

    good illustrations

  • M Almakrami

    your not explaining anithing

  • profvrr

    These illustrations are meant to accompany the TWiV podcast episode on virus structure:

  • rahmeen

    why virus is exluded from the five kingdom classification?

  • jack mogisa

    a virus cannot live independently outside a host cell because it cannot metabolize to create energy or synthesize amino acids to produce proteins or replicate itself. Therefore outside a host cell, a virus is non-living and only living organisms are classified into 5 kingdoms.

  • Padmanava Behera

    Dear Dr. Racaniello, how to understand the virus Icosaherdral symmetry with different triangular number?? can you please provide me some material…
    Thank You,

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