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VIRUSES

VIRUSES. CHAPTER 13. What are Viruses?. Obligate intracellular parasites Viral components Nucleic acids Capsid Envelope. Viral Shapes and Sizes. Helical Spherical Polyhedral. Infectious Properties. Viral Host range Spectrum of host Viral specificity Types of cells Viral Origins

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VIRUSES

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  1. VIRUSES CHAPTER 13

  2. What are Viruses? • Obligate intracellular parasites • Viral components • Nucleic acids • Capsid • Envelope

  3. Viral Shapes and Sizes • Helical • Spherical • Polyhedral

  4. Infectious Properties • Viral Host range • Spectrum of host • Viral specificity • Types of cells • Viral Origins • Unknown

  5. Nucleic Acid • DNA viruses • ds DNA • ss DNA • RNA viruses • + strand • – strand • Double strand

  6. 11 RNA Virus Families Picornaviridae • Togaviridae • Flaviviridae • Retroviridae • Paramyxoviridae • Rhabdoviridae • Orthomyxoviridae

  7. RNA Virus Families (cont.) • Filoviridae • Bunyaviridae • Arenaviridae • Reoviridae

  8. DNA Virus Families • Adenoviridae • Herpesviridae • Poxviridae • Papovaviridae • Hepadnaviridae • Parvoviridae Emerging Viruses: Previously endemic

  9. Viral Replication • Activities • Adsorption • Penetration (virus or chromosome) • Synthesis • Maturation • Release

  10. Bacteriophages • Plaque counts

  11. Culturing Animal Viruses • Eggs • Cell Culture • Primary • Continuous

  12. Viral Cytopathic Effects • Cytopathy • Teratogenic effects

  13. Viruslike Agents • Satellites • Prions • Viroids

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