Changes

==Clinical==

==Clinical==

[[Image:Dictyocaulus viviparus.jpg|right|thumb|100px|<small><center>Dictyocaulus viviparus (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]]

[[Image:Dictyocaulus viviparus.jpg|right|thumb|100px|<small><center>Dictyocaulus viviparus (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]]

[[Image:Parasitic bronchitis.jpg|right|thumb|100px|<small><center>Parasitic bronchitis (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]]

[[Image:Parasitic bronchitis.jpg|right|thumb|100px|<small><center>Parasitic bronchitis (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]]

*Found in [[Tracheitis#Infectious causes of tracheitis|trachea]] and [[Bronchi and Bronchioles Inflammatory - Pathology#Infectious causes of bronchitis or bronchiolitis|large bronchi]]

*Found in [[Tracheitis#Infectious causes of tracheitis|trachea]] and [[Bronchitis#Infectious causes of bronchitis or bronchiolitis|large bronchi]]

*Causes parasitic bronchitis, synonyms: bovine dictyocauliosis, husk, hoose

*Causes parasitic bronchitis, synonyms: bovine dictyocauliosis, husk, hoose

*Primary infection:

*Primary infection:

***Larvae migrate to lungs, no clinical signs

***Larvae migrate to lungs, no clinical signs

**Prepatent phase (weeks 1-3)

**Prepatent phase (weeks 1-3)

***Development and migration of larvae -> [[Bronchi and Bronchioles Inflammatory - Pathology#Bronchiolitis|bronchiolitis]] -> eosinophilic exudate -> air passage blocked -> alveolar collapse (distal to blockage) -> clinical signs (tachypnoea, coughing)

***Development and migration of larvae -> [[Bronchitis#Bronchiolitis|bronchiolitis]] -> eosinophilic exudate -> air passage blocked -> alveolar collapse (distal to blockage) -> clinical signs (tachypnoea, coughing)

**Patent phase (weeks 4-8)

**Patent phase (weeks 4-8)

***Egg-producing mature worms

***Egg-producing mature worms

***[[Bronchi and Bronchioles Inflammatory - Pathology#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

***[[Lungs Inflammatory - Pathology#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)