Difference between revisions of "Respiratory Parasitic Infections - Pathology"
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| − | ===[[ | + | ===[[Coccidiosis - Horse|''Besnoitia bennetti'']]=== |
==In Cattle== | ==In Cattle== | ||
| − | ===[[ | + | ===''[[Dictyocaulus viviparus]]''=== |
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===Hydatid cysts=== | ===Hydatid cysts=== | ||
Revision as of 09:25, 1 July 2010
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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
- The intermediate stage of Echinococcus granulosus can be found in the lungs of many species, most commonly in lungs of cattle and sheep
- They range in size up to 5-10 cm diameter and although of little clinical significance, are important as a zoonosis (can be upto football size in man) and because of carcass condemnation
Syngamus laryngeus
- In larynx of cattle in Asia and South America
In Sheep
Hydatid cysts
As in cattle (above)
Oestrus ovis
- Larvae in the nasal cavity of sheep and goats = Nasal bots
- Causes reaction in sinuses
Protostrongylus spp.
- Adult worms block small bronchioles resulting in accumulation of eggs, larvae and cellular debri distal to the blockage
- Lesions resemble Dictyocaulus filaria but are fewer in numbers, lobular and at periphery of caudal lobes, they are very similar to Muellerius capillaris lesions
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
- May cause parasitic pneumonia during a part of its migration
- Larvae may be infected with Swine influenza
- May cause severe pneumonia in calves housed where infected pigs were housed previously
- Cause diffuse interstitial pneumonia with haemorrhage, atelectasis, interlobular oedema and emphysema