Topic 31: Picornaviridae (Pico-RNA), Caliciviridae (Calic-cup), Astroviridea (Astro-star) -

Question 1

Topic 31: Picornaviridae (Pico-RNA), Caliciviridae (Calic-cup), Astroviridea (Astro-star)
PICORNAVIRIDAE:

Answer 1

• Genera:
• Entero-,
• Cardio-,
• Erbo-…
• Morphology: +ssRNA genome, non eveloped capsid.
• Resistance: Generally good
• Biological properties:
• Baltimore IV – Short replication cycle.
• Generally stenoxen.
• Antigenic properties: Good antigens, no cross reaction.
• Diagnosis:
• Enterovirus genus:
  Swine vesicular disease (SVD).
• Hepatovirus genus:
  Hepatitis A human.

Question 2

Topic 31: Picornaviridae (Pico-RNA), Caliciviridae (Calic-cup), Astroviridea (Astro-star)
PICORNAVIRIDAE:
Simple

Answer 2

• Genera:
• Entero-,
• Cardio-,
• Erbo-…
• +ssRNA genome, non eveloped capsid.
• Generally good resistance
• Biological properties:
• Baltimore IV – Short replication cycle.
• Generally stenoxen.
• Good antigens, no cross reaction.
• Diagnosis:
• Enterovirus genus:
  Swine vesicular disease (SVD).
• Hepatovirus genus:
  Hepatitis A human.

Question 3

Topic 31: Picornaviridae (Pico-RNA), Caliciviridae (Calic-cup), Astroviridea (Astro-star)
UCALICIVIRIDAE:

Answer 3

• Genera:
• Vesi-,
• Noro-,
• Sapo-…
• Morphology: +ssRNA, non enveloped capsid.
• Resistance: good.
• Biological properties:
• Baltimore IV – subgenomic mRNAs.
• Stenoxen,CPE: Lysis.
• Antigenic properties: Good antigens.
• Diagnosis:

Vesivirus genus:
- Feline colicivirus: respiratory disease.

Norovirus genus:
- Norwalk, Hawaii,Mexico…

Question 4

Topic 31: Picornaviridae (Pico-RNA), Caliciviridae (Calic-cup), Astroviridea (Astro-star)
UCALICIVIRIDAE:
Simple

Answer 4

• Genera:
• Vesi-,
• Noro-,
• Sapo-…
• +ssRNA, non enveloped capsid.
• Good resistance
• Biological properties:
• Baltimore IV – subgenomic mRNAs.
• Stenoxen,CPE: Lysis.
• Good antigens
• Diagnosis:

Vesivirus genus:
- Feline colicivirus: respiratory disease.

Norovirus genus:
- Norwalk, Hawaii,Mexico…

Question 5

Topic 31: Picornaviridae (Pico-RNA), Caliciviridae (Calic-cup), Astroviridea (Astro-star)
ASTROVIRIDAE:

Answer 5

• Genera:
• Astro-,
• Mamastro-…
• Morphology: Linear, +ssRNA, non enveloped capsid.
• Resistance: good.
• Biological properties:
• Stenoxen – host specific.
• Antigenic properties: Good antigens.
• Diagnosis:
• Astrovirus: Chicken nephritis.
• Mamastrovirus: Gastroenteritis.

Question 6

Topic 31: Picornaviridae (Pico-RNA), Caliciviridae (Calic-cup), Astroviridea (Astro-star)
ASTROVIRIDAE:
Simple

Answer 6

• Genera:
• Astro-,
• Mamastro-…
• Linear, +ssRNA, non enveloped capsid.
• Good resistance
• Good antigens
• Biological properties:
• Stenoxen – host specific.
• Diagnosis:
• Astrovirus: Chicken nephritis.
• Mamastrovirus: Gastroenteritis.