4.7 Viruses : The Enemy Within

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4.7 Viruses The Enemy
Within

• By Steffany Copeland

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Viruses are life mimicking particles

• Latin word for poison
• Viruses are nonliving
• Viruses cannot reproduce by themselves
• Viral genomes can be single or double stranded
• Viruses range from .027mm-0.03mm
• Obligate intracellular parasites
• The entire infectious virus particle as a whole-
  virion

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Viruses hosts

• Bacteria
• Animals
• Humans
• Plants
• Fungus
• Insects

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Viral Structure

• Nucleic acid
• Protein coat or capsid
• Envelope
• Tail
• Tail fibers
• End plate

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Lytic viral growth cycle of Bacteriophage

• Adsorption
• Penetration
• Replication
• Assembly
• Release

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Lytic replication cycle of rabies virus, an
enveloped virus with a single-stranded RNA genome
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Virions of enveloped viruses are released by
budding from an infected virus
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Rabies virus can be deadly

• Rabies virus travels slowly to the CNS where it
  replicates and then travels to the salivary
  glands where it replicates again
• There are 2 types of rabies Furious Rabies and
  Dumb Rabies

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The End

• ? Questions ?