Changes

* Infectious droplets tend to deposit in the anterior ventral portions of the lobes.

* Infectious droplets tend to deposit in the anterior ventral portions of the lobes.

** I.e. in the apical, cardiac and anterior portions of the diaphragmatic lobes.

** I.e. in the apical, cardiac and anterior portions of the diaphragmatic lobes.

* Airborne agents produce '''bronchopneumonia'''.

* Airborne agents produce [[Bronchopneumonia|'''bronchopneumonia''']].

** So-called because the inflammation is initiated and centred upon the airways.

** So-called because the inflammation is initiated and centred upon the airways.

* The usual appearance of bronchopneumonia in ruminants and the pig is as the name suggests.  

* The usual appearance of bronchopneumonia in ruminants and the pig is as the name suggests.  

*** Air trapped distal to the blockage is gradually absorbed into the bloodstream.

*** Air trapped distal to the blockage is gradually absorbed into the bloodstream.

**** This causes increased pressure on the injured wall, dilating it further.  

**** This causes increased pressure on the injured wall, dilating it further.  

*** This is a progressive process and results in irreversible dilatation of the airway lumen and is called '''bronchiectasis'''.

*** This is a progressive process and results in irreversible dilatation of the airway lumen and is called [[Bronchiectasis|'''bronchiectasis''']].

* Bronchopneumonia in the dog and cat often tends to be more diffusely spread.  

* Bronchopneumonia in the dog and cat often tends to be more diffusely spread.  

** These species have a poorly-developed interlobular septum and collateral ventilation between alveoli from different respiratory units.  

** These species have a poorly-developed interlobular septum and collateral ventilation between alveoli from different respiratory units.  

===Blood-borne Agents===

===Blood-borne Agents===

* Blood-bourne agents tend to have a patchy distribution throughout the lung.

* Blood-bourne agents tend to have a patchy distribution throughout the lung.

* Cause '''interstitial pneumonia'''.

* Cause [[Interstitial Pneumonia|'''interstitial pneumonia''']].

====Circulating Toxins====

====Circulating Toxins====

* For example, "Fog Fever" in adult cattle.

* For example, [[Acute Bovine Pulmonary Emphysema and Oedema|"Fog Fever"]] in adult cattle.

** Interstitial emphysema.

** Interstitial emphysema.

** 3-methyl indole is selectively toxic to Type 1 alveolar epithelium.

** 3-methyl indole is selectively toxic to Type 1 alveolar epithelium.