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Viruses

Explore the realm of viruses and their classification, reproduction cycles, and role in causing various diseases. Learn about viral structures, host ranges, epidemics versus pandemics, vaccinations, viroids, and prions. Discover how viruses blur the line between living and non-living entities.

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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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