*Live in [[Lungs Inflammatory - Pathology|lung parenchyma]] and [[Bronchi and Bronchioles Inflammatory - Pathology#Infectious causes of bronchitis or bronchiolitis|small bronchioles]]
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*Grossly:
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**Firm yellow nodules scattered throughout parenchyma, more frequently at periphery
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*Microscopically:
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**Eggs and larvae in the alveolar spaces cause a foreign body type reaction (surrounded by mononuclear cells and giant cells)
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**Submucosal gland hypertrophy and smooth muscle hypertrophy in airway and vessel walls
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*Associated clinical signs are mild although heavy infestations may -> chronic coughing
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*The airway eosinophilia which may be detected can be confused with a diagnosis of asthma