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Viruses

Viruses. But first…Classification Recap. And now back to Viruses!. 2.2. Living vs. Non-Living?. Organization (Cells) Metabolism Responsiveness Growth Reproduction Evolution Ecology. Examples of Viral Diseases.

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Viruses

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  1. Viruses

  2. But first…Classification Recap

  3. And now back to Viruses! 2.2

  4. Living vs. Non-Living? • Organization (Cells) • Metabolism • Responsiveness • Growth • Reproduction • Evolution • Ecology

  5. Examples of Viral Diseases • common cold, chicken pox, AIDS, cholera, rabies, influenza, hepatitis B, cold sores, measles, mumps, pneumonia, etc. • hepatitis C & links to liver cancer • many animal & plant viruses

  6. Epidemic vs. Pandemic • limited vs. widespread (usually global) geographic region • Have you seen this film? • http://www.youtube.com/watch?v=4sYSyuuLk5g

  7. Host Range • most are very specific • some can infect many species • bacteriophage infects bacteria cells

  8. Basic Structure • protein capsid • genetic material (DNA or RNA)

  9. Classification

  10. Viral Reproduction • lytic cycle (lysis) • lysogeny (dormancy)

  11. Vaccinations • global elimination of smallpox by WHO in 1980 • human papillomavirus (HPV) & connection to cervical cancer

  12. Gene Therapy

  13. Viroids • small infectious pieces of RNA without capsid • discovered in 1971 • responsible for some plant diseases

  14. Prions • abnormally-shaped infectious proteins • cause rare diseases in mammals • consumption of infected animals causes prions to enter blood and travel to brain

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