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==Description==  
 
==Description==  
Chronic gastritis is often characterised by persistent [[vomiting|vomiting]] of variable frequency and appearance. The underlying cause is unknown but chronic gastritis can be classified according to its histological appearance.
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Chronic gastritis is often characterised by persistent [[vomiting|vomiting]] of variable frequency and appearance. The underlying cause is unknown but chronic gastritis can be classified into one of four types according to its histological appearance.
'''Lymphocytic-plasmacytic gastritis''' which may be an immune response to numerous antigens. [[Helicobacter|''Helicobacter felis'']] has been suggested as a cause for such a reaction in dogs and cats.
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1)'''Lymphocytic-plasmacytic gastritis''' which may be an immune response to numerous antigens. [[Helicobacter|''Helicobacter felis'']] has been suggested as a cause for such a reaction in dogs and cats.
'''Eosinophilic gastritis''' which may result from an allergic reaction to food antigens.
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'''Atrophic gastritis''' which is thought to result from an immune reaction and/or chronic gastric inflammation.
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2)'''Eosinophilic gastritis''' which may result from an allergic reaction to food antigens.
'''Granulomatous gastritis''' which may be caused by ''Ollulanus tricuspis'' in cats.
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3)'''Atrophic gastritis''' which is thought to result from an immune reaction and/or chronic gastric inflammation.
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4)'''Granulomatous gastritis''' which may be caused by ''Ollulanus tricuspis'' in cats.
    
==Signalment==
 
==Signalment==
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