Changes

***Egg-producing mature worms

***Egg-producing mature worms

***[[Bronchitis|Bronchitis]] - due to mature worms

***[[Bronchitis|Bronchitis]] - due to mature worms

***[[Lungs Inflammatory - Pathology#Verminous pneumonia|Parasitic pneumonia]] - due to aspiration of eggs and larvae -> cellular infiltration of [[Neutrophils|neutrophils]], macrophages, giant cells

***[[Verminous Pneumonia|Parasitic pneumonia]] - due to aspiration of eggs and larvae -> cellular infiltration of [[Neutrophils|neutrophils]], macrophages, giant cells

**Postpatent phase (weeks 8-12)

**Postpatent phase (weeks 8-12)

***Majority of worms are expelled

***Majority of worms are expelled

*Two other types of lesion in lung tissue due to this worm have been reported:

*Two other types of lesion in lung tissue due to this worm have been reported:

**Nodules (2-4mm in diameter) with greenish centres in the reinfection of an immune animal - the host mounting a successful defence and preventing larval migration

**Nodules (2-4mm in diameter) with greenish centres in the reinfection of an immune animal - the host mounting a successful defence and preventing larval migration

**Pulmonary oedema and emphysema - thought to be a hypersensitivity response to a massive invasion of larvae in previously- sensitised animals - the gross and microscopic appearance is similar to that of [[Lungs Inflammatory - Pathology#Acute bovine pulmonary emphysema and oedema (ABPEE)|fog fever]]

**Pulmonary oedema and emphysema - thought to be a hypersensitivity response to a massive invasion of larvae in previously- sensitised animals - the gross and microscopic appearance is similar to that of [[Acute Bovine pulmonary Emphysema and Oedema|fog fever]]