Changes

*Histologically:

*Histologically:

**Catarrhal and eosinophilic bronchitis and bronchiolitis

**Catarrhal and eosinophilic bronchitis and bronchiolitis

**Possibly [[Lungs Ventilation - Pathology#Atelectasis (Collapse)|atelectasis]]

**Possibly [[Atelectasis|atelectasis]]

*Rarely becomes extensive

*Rarely becomes extensive

*May transmit [[Swine Influenza|swine influenza]]

*May transmit [[Swine Influenza|swine influenza]]