Rahbovirus

5 important questions on Rahbovirus

What is the source of Rhabdoviruses of human death?

Dogs are source of human rabies deaths
  • elimination possible by vaccinating dog
  • choking, can not swallow

What are Rabies virus its virus particle?

  • Enveloped (-)ssRNA virus
  • Encodes 5 structural proteins (nucleoprotein, phosphoprotein, matrix protein, glycoprotein and polymerase)
  • Viral mRNa are transcribed by polymerase stuttering (stop- and start-signals are located between ORFs) in cytoplasma
    • small genome can be used for multiple proteins coding

What is the life cycle of RABV (rabies virus)?

  1. Rhabdoviruses enter the cell via the endocytic pathway
  2. Both receptor recognition and membrane fusion are mediated by a single transmembrane viral glycoprotein (G)
  3. Uncoating occurs in the endosome due to low pH inducing fusion between the G-protein and the endosomal membrane, which releases the NC in the cytoplasm
  4. The L gene encodes the RNA-dependent RNA polymerase (RdRp); together with phospoprotein P it forms the viral replicase complex
  5. New virus particles bud from the cell
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How does the RABV evade the immune system?

RABV has a tropism for immunologically isolated tissues (CNS: central nerve system) and downregulation of the interferon (IFN) response

What are the vaccine agains RABV?

  • Live-attenuated vaccine (wild animals)
  • Inactivated vaccine (human and pets)

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