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Viruses - PowerPoint PPT Presentation


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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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Presentation Transcript
viruses1
Viruses
  • Non living
    • Cannot reproduce on their own
  • Reproduction
    • Need a host cell
  • Extremely small
viral structure
Viral Structure
  • No nucleus
  • Genetic Material
    • DNA or RNA
  • Capsid around outside
viral reproduction
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
viral transmission
Viral Transmission
  • Airborne
  • Sexual Contact
  • Contaminated food or water
  • Animal bites
human immunodeficiency virus hiv
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
influenza
Influenza
  • Transmitted by
    • Coughing
    • Sneezing
    • Contact
  • Symptoms
    • Fever
    • Headache
    • Severe aches and pains
    • Fatigue
    • Etc
do antibiotics work on viruses
Do antibiotics work on viruses?
  • No
    • They are not living
vaccines
Vaccines
  • Small amount of inactive virus
  • Help to prep body to defend against viruses
reflection questions
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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