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*May cause necrotising [[Bronchi and Bronchioles Inflammatory - Pathology#Infectious causes of bronchitis or bronchiolitis|bronchiolitis]] in immune-deficient foals (Arabian foals)
 
*May cause necrotising [[Bronchi and Bronchioles Inflammatory - Pathology#Infectious causes of bronchitis or bronchiolitis|bronchiolitis]] in immune-deficient foals (Arabian foals)
 
*Grossly:
 
*Grossly:
**[[Lungs - ventilation#Atelectasis (Collapse)|Atelectasis]] and consolidation of lobules in cranioventral region
+
**[[Lungs Ventilation - Pathology#Atelectasis (Collapse)|Atelectasis]] and consolidation of lobules in cranioventral region
 
**Mucopurulent exudate in airways
 
**Mucopurulent exudate in airways
 
*Histologically:
 
*Histologically:
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*Outbreaks of RSV associated disease usually occur associated with winter housing
 
*Outbreaks of RSV associated disease usually occur associated with winter housing
 
*Gross pathology in severe cases  
 
*Gross pathology in severe cases  
**Cranioventral [[Lungs - ventilation#Atelectasis (Collapse)|atelectasis]] and consolidation
+
**Cranioventral [[Lungs Ventilation - Pathology#Atelectasis (Collapse)|atelectasis]] and consolidation
**[[Lungs - ventilation#Emphysema|Interstitial emphysema]]  
+
**[[Lungs Ventilation - Pathology#Emphysema|Interstitial emphysema]]  
 
***More prominent in the caudal lung lobes
 
***More prominent in the caudal lung lobes
 
***Results from bronchoconstriction which results in airway obstruction - this constriction is thought to arise from [[Mast cells - Anatomy & Physiology|mast cell]] degranulation and histamine release
 
***Results from bronchoconstriction which results in airway obstruction - this constriction is thought to arise from [[Mast cells - Anatomy & Physiology|mast cell]] degranulation and histamine release
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*Clinical signs: pyrexia, lethargy, skin erythema, anorexia, severe cough and sneezing, dyspnoea, conjunctivitis, pregnant sows may abort
 
*Clinical signs: pyrexia, lethargy, skin erythema, anorexia, severe cough and sneezing, dyspnoea, conjunctivitis, pregnant sows may abort
 
*Grossly:
 
*Grossly:
**[[Trachea Inflammatory - Pathology|Tracheo]][[Bronchi and Bronchioles Inflammatory - Pathology#Infectious causes of bronchitis or bronchiolitis|bronchitis]], airway obstruction -> [[Lungs - ventilation#Atelectasis (Collapse)|atelectasis]]
+
**[[Trachea Inflammatory - Pathology|Tracheo]][[Bronchi and Bronchioles Inflammatory - Pathology#Infectious causes of bronchitis or bronchiolitis|bronchitis]], airway obstruction -> [[Lungs Ventilation - Pathology#Atelectasis (Collapse)|atelectasis]]
 
**[[Pleural Cavity & Membranes Inflammatory - Pathology|Pleura]] normal or covered with serous or serofibrinous exudate
 
**[[Pleural Cavity & Membranes Inflammatory - Pathology|Pleura]] normal or covered with serous or serofibrinous exudate
 
**[[Pleural Cavity & Membranes Inflammatory - Pathology|Pleural cavity]] filled with excess fluid
 
**[[Pleural Cavity & Membranes Inflammatory - Pathology|Pleural cavity]] filled with excess fluid

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