Flaviviridae
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Introduction
This group of viruses has three distinct genera, two of which are of veterinary concern. Flaviviruses, which are endemic vector-borne neurotropic viruses, include louping ill and West Nile Virus. Pestiviruses include Swine Fever and Bovine Virus Diarrhoea and present more hemorrhagic disease. Hepatitis C in man is also grouped in this classification.
Morphology
- Medium sized enveloped viruses
Types and Subtypes
Flavivirus
Louping Ill
West Nile Virus
Pestiviruses
Classical Swine Fever
Border Disease Virus
Bovine Virus Diarrhoea Virus
Pestiviruses
Bovine Viral Diarrhoea & Mucosal Disease Virus may also contribute to Enzootic pneumonia of calves, may cause growth retardation lattice
- Border Disease
- In sheep
- Virus crosses placenta
- Tropism for foetal lymphoid, hair follicle and CNS tissue
- Lambs born weak, small
- Hairy shaker syndrome
- Hair rather than wool coats and cerebellar hypoplasia