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==Description==
==Description==
Eosinophilia refers to an increase in the number of [[Eosinophil|eosinophils]] present in the blood or tissues. This form of leucocytosis is most commonly associated with '''parasitism''' or [[:Category:Hypersensitivity|'''hypersensitivity''']] reactions, including the following diseases:
Eosinophilia refers to an increase in the number of [[Eosinophil|eosinophils]] present in the blood or tissues. This form of leucocytosis can be associated with '''parasitism''' or [[:Category:Hypersensitivity|'''hypersensitivity''']] reactions.
==Hypersensitivity Reactions==
*[[Flea Allergic Dermatitis|'''Flea bite hypersensivity''']] is the most common cause of eosinophilia in cats and it may occur in animals with signs of miliary dermatitis. Food hypersensitivity reactions and [[Atopic Dermatitis|atopic dermatitis]] may also be variably associated with eosinophilia.
*[[Flea Allergic Dermatitis|'''Flea bite hypersensivity''']] is the most common cause of eosinophilia in cats and it may occur in animals with signs of miliary dermatitis. Food hypersensitivity reactions and [[Atopic Dermatitis|atopic dermatitis]] may also be variably associated with eosinophilia.
*'''[[Feline Eosinophilic Granuloma|Feline eosinophilic granuloma complex]]''' may be associated with blood or tissue eosinophilia. The eosinophilic ulcer form is rarely associated with systemic changes whereas eosinophilia is a near constant feature of the eosinophilic plaque. The linear granuloma is variably associated with blood eosinophilia.
*'''[[Feline Eosinophilic Granuloma|Feline eosinophilic granuloma complex]]''' may be associated with blood or tissue eosinophilia. The eosinophilic ulcer form is rarely associated with systemic changes whereas eosinophilia is a near constant feature of the eosinophilic plaque. The linear granuloma is variably associated with blood eosinophilia.
*'''[[Feline Asthma Syndrome|Feline asthma syndrome]]''', canine '''[[Pulmonary Infiltration with Eosinophilia|pulmonary infiltration with eosinophils (PIE)]]''' and equine '''eosinophilic pulmonary granulomas''' may all be associated with blood eosinophilia.
*'''[[Feline Asthma Syndrome|Feline asthma syndrome]]''', canine '''[[Pulmonary Infiltration with Eosinophilia|pulmonary infiltration with eosinophils (PIE)]]''' and equine '''eosinophilic pulmonary granulomas''' may all be associated with blood eosinophilia.
==Parasite Infection==
Both endo- and ecto-parasite infections may result in blood eosinophilia, in particular:
*''[[Aelurostrongylus abstrusus]]'', the feline lungworm.
*''[[Aelurostrongylus abstrusus]]'', the feline lungworm.
*''[[Dirofilaria immitis]]'' which causes heartworm disease.
*''[[Dirofilaria immitis]]'' which causes heartworm disease.
*Gastro-intestinal parasites including ''[[Toxocara canis]]'' and the other toxascarids of dogs and cats.
*Gastro-intestinal parasites including ''[[Toxocara canis]]'' and the other toxascarids of dogs and cats.
==Miscellaneous==
*The rare form of eosinophilic '''chronic myeloid leukaemia''' may result in the abnormally high production of eosinophils.
*The rare form of eosinophilic '''chronic myeloid leukaemia''' may result in the abnormally high production of eosinophils.
*'''[[Hypoadrenocorticism]]''' or Addison's disease may be associated with eosinophilia, a feature that may help to differentiate it from other diseases as such severely ill animals would usually be expected to have a stress leucogram.
*'''[[Hypoadrenocorticism]]''' or Addison's disease may be associated with eosinophilia, a feature that may help to differentiate it from other diseases as such severely ill animals would usually be expected to have a stress leucogram.