Bovine Viral Diarrhoea Virus Flashcards
1
Q
What are the two genotypes and biotypes of BVD virus?
A
Genotypes:
- BVDV 1 - Classical form
- BVDV 2 - Severe acute BVD
Biotypes:
- Non-cytopathic (NCP) ~90%
- Cytopathic (CP) ~10%
2
Q
What are the main clinical syndromes of naive calves?
A
Pyrexia +/- diarrhoea
Immunosuppression
Acute haemorrhagic enteritis + death
3
Q
What are three clinical syndromes of persistently infected calves?
A
Poor growth rates
Immunosuppression
Mucosal disease
4
Q
How is BVD transmitted?
A
Faecal-oral
Transplacental
5
Q
How can persistently infecter cattle develop mucosal disease?
A
Mutation of NCP
Superinfection with CP
6
Q
How would you diagnose BVD?
A
Clinical signs
Post-mortem examination
Laboratory testing
7
Q
What is the aim of BVD vaccination?
A
Prevention of the birth of PI calves
