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Introduction

Introduction. Shapes. Characteristics. non living parasitic Reproduce Mutate. What do all of these viruses have in common?. Types. A = antigenic drift/shift causes worldwide death Both humans and other animals B = antigenic drift Can cause death/less severe Usually only in humans

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Introduction

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Presentation Transcript

  1. Introduction

  2. Shapes

  3. Characteristics non living parasitic Reproduce Mutate

  4. What do all of these viruses have in common?

  5. Types • A= antigenic drift/shift • causes worldwide death • Both humans and other animals • B= antigenic drift • Can cause death/less severe • Usually only in humans • C=antigenically stable • Mild illnesses only in humans

  6. Terminology • Antigenic drift • natural mutation causing minor changes to surface proteins hemagglutinin(H) and neuraminidase(N) • Frequently occurs in Types A,B,& C

  7. Terminology • Antigenic shift • Only Type A (humans and other animals) • Combination of 2 or more viral strains H1N1 + H5N3= H5N1 or H1N3 • Leads to reassortment of phenotype

  8. Summary • Flu viruses all have a common sphere shape, capsid, genetic material • Types: A, B, and C • Mutations lead to subtypes and strains

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