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Respiratory Viral Infections (view source)

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→‎In Sheep

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==In Sheep==

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===Maedi Visna===

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===[[Maedi - Visna]]===

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*Caused by a [[Retroviridae|retrovirus]]

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*The respiratory from of the disease caused by maedi-visna virus (Maedi) is also called '''lymphoid interstitial pneumonia'''

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*Transmitted by close contact and via milk

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*The pulmonary lesions develop very slowly hence this disease is uncommon in sheep < 2 years old

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*Increased respiratory rate upon exertion, loss of weight

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*Remains in [[Monocytes]] and macrophages

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*Gross findings

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**Severe [[Lungs Inflammatory - Pathology#Interstitial pneumonia|interstitial pneumonia]]

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**Lungs fail to collapse properly on opening the chest and can weigh more than twice the normal weight

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**Impressions of the ribs remain on the visceral pleura

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**Lungs are a mottled grey/ tan colour - the lesions can vary from irregular grey speckling to homogeneous grey consolidation

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**Rubbery in consistence

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**Diaphragmatic lobes most affected

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**Associated bronchial and mediastinal lymph nodes are often enlarged

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*Histologically

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**Major features are extensive lymphoid proliferation around perivascular, peribronchial and peribronchiolar sheaths associated with pulmonary lymphatics

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**Many of these areas contain germinal centres and smooth muscle hyperplasia (in walls of terminal bronchioles and alveoli)

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*See [[Lungs Hyperplastic and Neoplastic - Pathology#Sheep pulmonary adenomatosis (SPA/ Jaagsiekte)|neoplasia]]

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==In Goats==

Bara

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Respiratory Viral Infections (view source)

Revision as of 12:08, 30 June 2010

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