Localization of S100A12 positive cells and Helicobacter organisms was studied using paraffin-embedded gastric biopsies, 11 from dogs with chronic gastritis and 9 from healthy control dogs (5 of these were obtained post-mortem after the patient had presented to the emergency service at the Veterinary Teaching Hospital at Texas A&M University, none of which had gross or histopathological lesions suggesting gastrointestinal disease and 4 were research dogs from Universidad de Caldas).