Veterinary Systemic Pathology Online


P-P14A - Filariasis - lung - dog


Morphologic Diagnosis:   Lung: Pneumonia, bronchointerstitial, pyogranulomatous and eosinophilic, diffuse, severe, with numerous nematode adults and larvae, breed not specified, canine.


Etiologic Diagnosis:   Filaroidial pneumonia


General Discussion:

  • Superfamily Metastrongyloidea:
    • Family Filaroididae:
      • Filaroides hirthi
      • Oslerus osleri (Filaroides osleri)
    • Family Angiostrongylidea
      • Andersonstrongylus milksi (Filaroides milksi)
  • These species have a wide geographic distribution but infection is fairly rare.
  • Filaroides does not require an intermediate host (direct life cycle) unlike other metastrongyles.
  • Respiratory parasites found in canidae, mink, and monkeys


Typical Clinical Findings:

  • Some dogs are asymptomatic or may have a chronic non-productive cough which is exacerbated by exercise, excitement, or cold air





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