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Viruses

Viruses. “They Are Not Alive!”. Viruses. Non-Living?. Viruses DO NOT : Metabolize on their own Reproduce Move Take in food Grow Consist of cells. What they can do is take a host cell “ Hostage”. Bacteriophage. Consist of a protein coat called a Capsid Contain Viral DNA

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Viruses

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  1. Viruses “They Are Not Alive!”

  2. Viruses

  3. Non-Living? Viruses DO NOT: • Metabolize on their own • Reproduce • Move • Take in food • Grow • Consist of cells

  4. What they can do is take a host cell “Hostage”

  5. Bacteriophage • Consist of a protein coat called a Capsid • Contain Viral DNA • Special Ligands allow the virus to attach to the cell receptors of a host cell.

  6. Viral Infection A virus can reproduce in two ways: 1.The Lytic Cycle: infects and affects the host cell very quickly. Flu, Ebola, Cold 2. The Lysogenic Cycle: infects but does not affectimmediately HIV, Herpes

  7. The Lytic Cycle

  8. The Lysogenic Cycle INCUBATION PERIOD

  9. Lytic Cycle Animation • Lytic Cycle #2 • Virus Attack • H1N1 • Lytic Infection PH

  10. Viral Infections • Small Pox • Chicken Pox • Herpes • Hanta • Mumps • Measles • Polio • Hepatitis • West Nile • Corona • Encephalitis • Influenza • Meningitis • Ebola • HIV • Lassa Fever • Mononucleosis • Rabies • Dengue Fever • Yellow Fever • H1N1 (Swine Flu)

  11. Vaccines • Vaccines are used to establish immunity. • They can be made of weakened viruses or “dead” viruses. • The body recognizes and destroys the viruses. It will“remember” them so that the next time they are in the body, they will be destroyed. • Ex. The H1N1 Shot

  12. More Human Viral Diseases • Chicken Pox • Mumps • Herpes • Hepatitis • Warts • How big are Viruses?

  13. Viroids and Prions • Viroids • Infections agents composed of a single, circular strand of RNA. They are not protected with a protein coat. • Viroid RNA does not code for any known protein. • Mostly affect plants but recently have been found to affect humans.

  14. Viroids and Prions • Prions • An infectious particle made of protein • Affect the brain or neural tissue. • All are untreatable and fatal • Ex. Mad Cow Disease

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