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VIRUSES




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

Flaviviruses

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


Swine Fever Virus


  • 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