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Viruses

Viruses. Viruses. Non living Cannot reproduce on their own Reproduction Need a host cell Extremely small. Viral Structure. No nucleus Genetic Material DNA or RNA Capsid around outside. Viral Reproduction. Viruses need a specific host cell Virus injects DNA or RNA into cell

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Viruses

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  1. Viruses

  2. Viruses • Non living • Cannot reproduce on their own • Reproduction • Need a host cell • Extremely small

  3. Viral Structure • No nucleus • Genetic Material • DNA or RNA • Capsid around outside

  4. Viral Reproduction • Viruses need a specific host cell • Virus injects DNA or RNA into cell • Cell produces more viruses • Host cell is destroyed at end of viral reproduction

  5. Viral Transmission • Airborne • Sexual Contact • Contaminated food or water • Animal bites

  6. Human Immunodeficiency Virus (HIV) • Attacks Helper T Cells • T-Cells fight disease • Disables immune system • Person dies from secondary infection • Transmitted • Sexual contact • Sharing needles

  7. Influenza • Transmitted by • Coughing • Sneezing • Contact • Symptoms • Fever • Headache • Severe aches and pains • Fatigue • Etc

  8. Do antibiotics work on viruses? • No • They are not living

  9. Vaccines • Small amount of inactive virus • Help to prep body to defend against viruses

  10. Reflection Questions • 1. If you have a viral infection should you take antibiotics? Why or why not? • Name at least two viruses. • What does a virus need to reproduce?

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