Introduction
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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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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

  • C=antigenically stable

    • Mild illnesses only in humans


  • Terminology

    • Antigenic drift

      • natural mutation causing minor changes to surface proteins hemagglutinin(H) and neuraminidase(N)

      • Frequently occurs in Types A,B,& C


    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


    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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