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

Introduction


Shapes

Shapes


Characteristics

Characteristics

non living

parasitic

Reproduce

Mutate


What do all of these viruses have in common

What do all of these viruses have in common?


Types

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

    Terminology

    • Antigenic drift

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

      • Frequently occurs in Types A,B,& C


    Terminology1

    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

    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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