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Maedi-Visna (Ovine Progressive Pneumonia)
Infectious DiseaseOvineNew
Key Points
  • Maedi-Visna is a lentivirus that causes chronic, progressive disease in sheep
  • Infection usually occurs in early life but clinical signs develop after a long incubation period (typically >2 years old)
  • The virus targets monocytes and macrophages
  • It integrates into the host genome so infection is lifelong
  • The main signs are progressive dyspnoea, wasting and possible neurological deficits
  • Diagnosis combines clinical presentation, serology, PCR and post-mortem findings
  • There is no treatment or vaccine available
  • Control is based on test-and-cull programmes
Differential Diagnoses
  1. Jaagsiekte (Ovine Pulmonary Adenocarcinoma)
  2. Scrapie
  3. Johne’s disease (Paratuberculosis)
Overview
Aetiology
Clinical Signs
Diagnosis
Treatment
Prevention
Resources
Overview

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Aetiology

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Clinical Signs

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Diagnosis

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Treatment

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Prevention

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Resources

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Educational content only. This factsheet is for general veterinary education and is not a substitute for professional veterinary advice, diagnosis, or treatment. Not for use in an emergency — contact a veterinarian or emergency service. Full disclaimer →