Respiratory Parasitic Infections - Pathology

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()Map CARDIORESPIRATORY SYSTEM (Map)
RESPIRATORY SYSTEM INFLAMMATION



In Dogs

Filaroides osleri

Linguatula serrata

Angiostrongylus vasorum

Dirofilaria immitis

Capillaria aerophila

Toxoplasmosis

Crenosoma vulpis

In Cats

Linguatula serrata

  • As in dogs above

Aelurostrongylus abstrusus

Dirofilaria immitis

Capillaria aerophila

  • As in dogs above

In Horses

Parascaris equorum

Dictyocaulus arnfieldi

Besnoitia bennetti

In Cattle

Dictyocaulus viviparus

Hydatid cysts

Syngamus laryngeus

In Sheep

Hydatid cysts

As in cattle (above)

Oestrus ovis

Protostrongylus spp.

Muellerius capillaris

  • Common in sheep and goats
  • Rarely any clinical significance
  • Grossly:
    • Multifocal interstitial pneumonia grossly evident as firm "lead-shot" nodules throughout the parenchyma, often with enveloping granulomatous response
    • Early stages are reddish in colour, turning later to greyish green, may calcify
    • Mostly in dorsal region of caudal lung lobes
  • Histologically:
    • Damaged alveolar septa with mild fibrous thickening and lymphocytic infiltrate
    • In more developed host resistance, foci of eosinophils around larvae, hyperplastic epithelium, macrophages, giant cells
    • May be some calcification

Dictyocaulus filaria

  • Most susceptible when first exposed to contaminated pasture
  • Animals < 1 year old
  • Pathogenesis and pathology similar to Dictyocaulus viviparus in cattle
  • Bronchitis

In Pigs

Metastrongylus spp.

  • Found in bronchioles and smaller bronchi
  • Grossly:
    • Small grey nodules, especially along ventral border of caudal lobes
    • Adult worms in bronchi and bronchioles
  • Histologically:
    • Catarrhal and eosinophilic bronchitis and bronchiolitis
    • Possibly atelectasis
  • Rarely becomes extensive
  • May transmit swine influenza

Ascaris suum