Topic 30: Reoviridae (Respiratory Enteric Orphan) and Birnaviridae (bi-RNA) –

Question 1

Topic 30: Reoviridae (Respiratory Enteric Orphan) and Birnaviridae (bi-RNA)
REOVIRIDAE:

Answer 1

• Genera:
• Ortho-,
• Orbi-…
• Morphology: Segmented dsDNA, non enveloped capsid.
• Resistance:
• Ortho-, Rota- : STRONG,
• Orbi-, colti-: weaker.
• Biological properties:
• Baltimore III – viral transcriptase.
• Orbi-, Rota-: hard to propagate.
• Antigenic properties: good antigens – cross reaction.
• Diagnosis:
  Orthoreovirus genus:
  1) Mammalian reovirus.
  Avian reovirus

Question 2

Topic 30: Reoviridae (Respiratory Enteric Orphan) and Birnaviridae (bi-RNA)
REOVIRIDAE:
Simple

Answer 2

• Genera:
• Ortho-,
• Orbi-…
• Segmented dsDNA, non enveloped capsid.
• Ortho-, Rota- : STRONG resistance,
  Orbi-, colti-: weaker resistance.
• Biological properties:
• Baltimore III – viral transcriptase.
• Orbi-, Rota-: hard to propagate.
• Good antigens – cross reaction.
• Diagnosis:
  Orthoreovirus genus:
• Mammalian reovirus.
• Avian reovirus

Question 3

Topic 30: Reoviridae (Respiratory Enteric Orphan) and Birnaviridae (bi-RNA)
BIRNAVIRIDAE:

Answer 3

• Genera:
• Entero-,
• Cardio-…
• Morphology: +ssRNA genome, non enveloped capsid.
• Resistance: Generally good
• Biological properties:
• Baltimore III.
• Propagation in specific tissues.
• Antigenic properties: Good antigens, no croos reaction.
• Diagnosis:
• Infectious bursal disease (Immunosuppression)

Question 4

Topic 30: Reoviridae (Respiratory Enteric Orphan) and Birnaviridae (bi-RNA)
BIRNAVIRIDAE:
Simple

Answer 4

• Genera:
• Entero-,
• Cardio-…
• +ssRNA genome, non enveloped capsid.
• Generally good resistance
• Biological properties:
• Baltimore III.
• Propagation in specific tissues.
• Good antigens, no croos reaction.
• Diagnosis:
• Infectious bursal disease (Immunosuppression)