Dictyocaulosis - Sheep

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Pathogenesis

  • Dictyocaulus filaria
    • Similar to D. viviparus in cattle
    • Lesions tend to be less widespread because worm numbers are generally low

Diagnosis

  • Grazing history
  • Clinical signs
  • Faecal examination (larval identification possible by examining head, e.g. Dictyocaulus filaria (knob) or tail, e.g. Muellerius (single spine), Protostrongylus (wavy, no spine) → prognosis)

Control

  • Dictyocaulus filaria:
    • Difficult because outbreaks are unpredictable
    • PGE control measures are normally sufficient to prevent outbreaks of disease
    • Where these occur, remove and treat affected stock, replace with older immune sheep if necessary
    • A commercial vaccine was available in the Middle East, though its use (were it still available) would be uneconomic in the UK

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