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CLASSIFICATION OF VIRUSES

CLASSIFICATION OF VIRUSES. CHAPTER 2 Prepared by Miss Rashidah Hj Iberahim. CONTENT. Naming of viruses Criteria used in classification of viruses Baltimore classification. Viral specificity. Capable to infecting all forms of life (hosts)

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CLASSIFICATION OF VIRUSES

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  1. CLASSIFICATION OF VIRUSES CHAPTER 2 Prepared by Miss RashidahHjIberahim MIC208 - VIROLOGY

  2. CONTENT MIC208 - VIROLOGY • Naming of viruses • Criteria used in classification of viruses • Baltimore classification

  3. Viral specificity MIC208 - VIROLOGY Capable to infecting all forms of life (hosts) However, a range of virus could only specify infecting a certain range of hosts Viral specificity is the specific kinds of virus that can infect specific cell – papillomavirus can only infect skin cell

  4. Criteria of classification MIC208 - VIROLOGY

  5. Reasons beyond classification MIC208 - VIROLOGY Classification of virus been determined by the structural and chemical composition of virus Are apply to all plant viruses, animal viruses and bacterial viruses Virus is acellular cell – cannot be categorisedusing taxonomic classification It used International Committee on Taxonomy of Viruses (ICTV) to classify the viruses

  6. Examples Plant virus Animal virus MIC208 - VIROLOGY

  7. Before discovery MIC208 - VIROLOGY Dermotropic– infected skin cell Neurotrophic – infected nerve cell Viscerotropic – infect organ of digestive tract Pneumotropic – infected respiratory system

  8. After discovery MIC208 - VIROLOGY Type and structure of their nucleic acids Methods of replication Host range Chemical and physical characteristics

  9. Type and structure of their nucleic acids MIC208 - VIROLOGY RNA virus (+) sense (-) sense double stranded DNA virus single stranded double stranded

  10. RNA viruses (+ve sense) MIC208 - VIROLOGY Picornaviridae Togaviridae Flaviviridae Retroviridae

  11. RNA viruses (-ve sense) MIC208 - VIROLOGY Paramyxoviridae Rhabdoviridae Orthomyxoviridae Filoviridae Bunyaviridae Reoviridae (double-stranded)

  12. DNA viruses MIC208 - VIROLOGY Double – stranded • Adenoviridae • Herpesviridae • Poxviridae • Papovaviridae • Hepadnaviridae Single – stranded • Parvoridae

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