Changes

**Mild catarrhal inflammation resolves in 7 days and the lung is back to normal within 3 weeks

**Mild catarrhal inflammation resolves in 7 days and the lung is back to normal within 3 weeks

**More severe inflammation becomes chronic with fibrosis or [[Bronchi and Bronchioles Inflammatory - Pathology#Bronchiectasis|bronchiectasis]]

**More severe inflammation becomes chronic with fibrosis or [[Bronchi and Bronchioles Inflammatory - Pathology#Bronchiectasis|bronchiectasis]]

**[[Lungs - inflammatory#Pulmonary abscesses|Abscess]] formation with pyogenic bacteria

**[[Lungs Inflammatory - Pathology#Pulmonary abscesses|Abscess]] formation with pyogenic bacteria

**'''Pleuritis''' in severe fibrinous pneumonia with adhesions

**'''Pleuritis''' in severe fibrinous pneumonia with adhesions

**Death in fulminating cases due to hypoxaemia and toxaemia

**Death in fulminating cases due to hypoxaemia and toxaemia

**Parasites passing through the lung as part of their migration e.g. [[Respiratory Parasitic Infections - Pathology#Ascaris suum|''Ascaris suum'']] in the pig, aberrant migration in the case of flukes;

**Parasites passing through the lung as part of their migration e.g. [[Respiratory Parasitic Infections - Pathology#Ascaris suum|''Ascaris suum'']] in the pig, aberrant migration in the case of flukes;

**Parasites for which the lung is the target tissue e.g. [[Respiratory Parasitic Infections - Pathology#Dictyocaulus viviparus|''Dictyocaulus viviparus'']]

**Parasites for which the lung is the target tissue e.g. [[Respiratory Parasitic Infections - Pathology#Dictyocaulus viviparus|''Dictyocaulus viviparus'']]

*Lesions can vary from interstitial to [[Bronchi and Bronchioles Inflammatory - Pathology#Chronic bronchitis|chronic bronchitis]] to [[Lungs - inflammatory#Granulomatous pneumonia|granulomatous pneumonia]]

*Lesions can vary from interstitial to [[Bronchi and Bronchioles Inflammatory - Pathology#Chronic bronchitis|chronic bronchitis]] to [[Lungs Inflammatory - Pathology#Granulomatous pneumonia|granulomatous pneumonia]]

*May be infiltrate of eosinophils in pulmonary interstitium and bronchoalveolar spaces

*May be infiltrate of eosinophils in pulmonary interstitium and bronchoalveolar spaces

*[[Lungs Ventilation - Pathology#Atelectasis (Collapse)|Atelectasis]] and [[Lungs Ventilation - Pathology#Emphysema|emphysema]] may result due to obstruction

*[[Lungs Ventilation - Pathology#Atelectasis (Collapse)|Atelectasis]] and [[Lungs Ventilation - Pathology#Emphysema|emphysema]] may result due to obstruction

*Can be a consequence of:  

*Can be a consequence of:  

# [[Lungs Circulatory - Pathology#Embolism, thrombosis and infarction|'''Septic emboli''']] lodging in the pulmonary vessels

# [[Lungs Circulatory - Pathology#Embolism, thrombosis and infarction|'''Septic emboli''']] lodging in the pulmonary vessels

# '''Extension''' from severe focal suppurative [[Lungs - inflammatory#Bronchopneumonia|bronchopneumonia]]

# '''Extension''' from severe focal suppurative [[Lungs Inflammatory - Pathology#Bronchopneumonia|bronchopneumonia]]

# '''Aspiration''' of foreign material (see [[Lungs - inflammatory#Aspiration pneumonia|aspiration pneumonia]])

# '''Aspiration''' of foreign material (see [[Lungs Inflammatory - Pathology#Aspiration pneumonia|aspiration pneumonia]])

# Direct '''penetration'''

# Direct '''penetration'''

**Most commonly [[Control of Feeding - Anatomy & Physiology#The Vomit Reflex|vomited]]/regurgitated material or contrast medium introduced into airways

**Most commonly [[Control of Feeding - Anatomy & Physiology#The Vomit Reflex|vomited]]/regurgitated material or contrast medium introduced into airways

**In severe acute cases may die from septic shock

**In severe acute cases may die from septic shock

**In chronic cases -> [[Lungs - inflammatory#Bronchopneumonia|bronchopneumonia]]

**In chronic cases -> [[Lungs Inflammatory - Pathology#Bronchopneumonia|bronchopneumonia]]

**Common sequel to [[Oesophagus#Myasthenia Gravis|myasthenia gravis]], [[Oesophagus#Congenital Achalasia - Megaoesophagus|megaoesophagus]] or [[Heart and Great Vessels Development - Pathology#Persistent Right Aortic Arch|persistent right aortic arch]]

**Common sequel to [[Oesophagus#Myasthenia Gravis|myasthenia gravis]], [[Oesophagus#Congenital Achalasia - Megaoesophagus|megaoesophagus]] or [[Heart and Great Vessels Development - Pathology#Persistent Right Aortic Arch|persistent right aortic arch]]

*Due to aspiration of amniotic fluid contaminated with meconium and bacteria

*Due to aspiration of amniotic fluid contaminated with meconium and bacteria

**Secondary to fetal distress

**Secondary to fetal distress

**Microscopic lesions of [[Lungs - inflammatory#Bronchopneumonia|bronchopneumonia]]

**Microscopic lesions of [[Lungs Inflammatory - Pathology#Bronchopneumonia|bronchopneumonia]]

**Involves all lobes (versus postnatal bronchopneumonia)

**Involves all lobes (versus postnatal bronchopneumonia)

*Haematogenous spread

*Haematogenous spread

**Causes [[Lungs - inflammatory#Interstitial pneumonia|interstitial pneumonia]]

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

**Often caused by ''Listeria monocytogenes'', ''Salmonella'' spp. or ''Chlamydia psittaci''

**Often caused by ''Listeria monocytogenes'', ''Salmonella'' spp. or ''Chlamydia psittaci''

*In viral abortions

*In viral abortions

**Cause [[Lungs - inflammatory#Bronchointerstitial pneumonia|bronchointerstitial pneumonia]]

**Cause [[Lungs Inflammatory - Pathology#Bronchointerstitial pneumonia|bronchointerstitial pneumonia]]

**E.g.: [[Respiratory Viral Infections - Pathology#Infectious bovine rhinotracheitis (IBR)|IBR]], [[Respiratory Viral Infections - Pathology#Parainfluenza- 3|PI-3]] and [[Respiratory Viral Infections - Pathology#Equine rhinopneumonitis|equine viral rhinopneumonitis]]

**E.g.: [[Respiratory Viral Infections - Pathology#Infectious bovine rhinotracheitis (IBR)|IBR]], [[Respiratory Viral Infections - Pathology#Parainfluenza- 3|PI-3]] and [[Respiratory Viral Infections - Pathology#Equine rhinopneumonitis|equine viral rhinopneumonitis]]