***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 - Pathology#Emphysema|interstitial emphysema]] and [[Pulmonary Oedema|pulmonary oedema]], or secondary bacterial infection
+
***May be together with [[Pulmonary Emphysema|interstitial emphysema]] and [[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