− | Pulmonary Infiltration with Eosinophilia is a broad term describing inflammatory lung disease in which the predominant infiltrating cell is the eosinophil. It is thought to be an immune mediated condition where the airway abnormalities are a consequence of a reaction to an unidentified allergen. | + | Pulmonary Infiltration with Eosinophilia is a broad term describing an inflammatory lung disease in which the predominant infiltrating cell is the eosinophil. It is thought to be an immune mediated condition where the airway abnormalities are a consequence of a hypersensitivity reaction to an unidentified allergen such as microfilariae of heartworms, lungworms, chronic bacterial or fungal infections (eg, histoplasmosis, aspergillosis), viruses, external antigens, and unknown precipitating factors |