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Haemonchosis (H. contortus)
Infectious DiseaseParasiteOvineNew
Key Points
  • Haemonchosis is a parasitic gastrointestinal infection caused by Haemonchus contortus nematodes
  • It primarily affects sheep & goats
  • Adult worms attach to the abomasal mucosa and blood feed, causing anaemia
  • Clinical signs include pale mucous membranes, weakness and submandibular oedema
    • Sudden death can occur in acute cases
  • Diagnosis relies on clinical presentation and faecal egg counts
  • Anthelmintic resistance is common in H. contortus so targeted treatments and informed drug choices are essential
  • Sustainable parasite control depends on good animal and pasture management, targeted treatments and monitoring of drug efficacy
Differential Diagnoses
  1. Fasciolosis (liver fluke)
  2. Copper deficiency
  3. Ostertagiosis (O. ostertagi)
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 →