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***Majority of worms are expelled
 
***Majority of worms are expelled
 
***In 25% of cases clinical signs may reappear as a result of alveolar epithelialisation
 
***In 25% of cases clinical signs may reappear as a result of alveolar epithelialisation
***May be together with [[Lungs - ventilation#Emphysema|interstitial emphysema]] and [[Lungs - circulatory#Pulmonary oedema|pulmonary oedema]], or secondary bacterial infection
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***May be together with [[Lungs Ventilation - Pathology#Emphysema|interstitial emphysema]] and [[Lungs - circulatory#Pulmonary oedema|pulmonary oedema]], or secondary bacterial infection
 
*Reinfection syndrome:
 
*Reinfection syndrome:
 
**Immune cattle show clinical signs only if exposed to large numbers
 
**Immune cattle show clinical signs only if exposed to large numbers
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*Histologically:
 
*Histologically:
 
**Catarrhal and eosinophilic bronchitis and bronchiolitis
 
**Catarrhal and eosinophilic bronchitis and bronchiolitis
**Possibly [[Lungs - ventilation#Atelectasis (Collapse)|atelectasis]]
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**Possibly [[Lungs Ventilation - Pathology#Atelectasis (Collapse)|atelectasis]]
 
*Rarely becomes extensive
 
*Rarely becomes extensive
 
*May transmit [[Respiratory Viral Infections - Pathology#Swine influenza|swine influenza]]
 
*May transmit [[Respiratory Viral Infections - Pathology#Swine influenza|swine influenza]]
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*Larvae may be infected with [[Respiratory Viral Infections - Pathology#Swine influenza|Swine influenza]]
 
*Larvae may be infected with [[Respiratory Viral Infections - Pathology#Swine influenza|Swine influenza]]
 
*May cause severe pneumonia in calves housed where infected pigs were housed previously
 
*May cause severe pneumonia in calves housed where infected pigs were housed previously
*Cause diffuse [[Lungs - inflammatory#Interstitial pneumonia|interstitial pneumonia]] with haemorrhage, [[Lungs - ventilation#Atelectasis (Collapse)|atelectasis]], [[Lungs - circulatory#Pulmonary oedema|interlobular oedema]] and [[Lungs - ventilation#Emphysema|emphysema]]
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*Cause diffuse [[Lungs - inflammatory#Interstitial pneumonia|interstitial pneumonia]] with haemorrhage, [[Lungs Ventilation - Pathology#Atelectasis (Collapse)|atelectasis]], [[Lungs - circulatory#Pulmonary oedema|interlobular oedema]] and [[Lungs Ventilation - Pathology#Emphysema|emphysema]]

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