title: Delayed hypersensitivity skin test for detection of immune responses against Salmonella in cattle.
abstract: Intracutaneous injection of a crude supernatant fraction from homogenised Salmonella typhimurium (O antigens 4, 5, 12) or S dublin (O antigens 9, 12) in 250 cattle or calves from salmonella infected herds elicited in 27 per cent and 42 per cent, respectively, a local dermal reaction. Both the time course and histological examinations of biopsy materials indicated a delayed type of hypersensitivity reaction. No local dermal reactions were seen in any of 250 heads of cattle or calves from control herds. The immunological characterisation of the S typhimurium and S dublin crude extracts revealed that they contained O antigens (ie, lipopolysaccharides) and outer membrane proteins, porins. A Yersinia enterocolitica serotype O3 extract did not evoke skin reactions in any of 70 tested animals. Fifteen calves infected with S typhimurium and five with S dublin exhibited increased ELISA titres against the O antigenically homologous lipopolysaccharides.
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000032:analysis; D000942:Antigens, Bacterial / Q000032:analysis; D002417:Cattle; D002418:Cattle Diseases / Q000175:diagnosis* / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D012475:Salmonella / Q000276:immunology; D012481:Salmonella Infections, Animal / Q000175:diagnosis* / Q000276:immunology; D012486:Salmonella typhimurium / Q000276:immunology; D012882:Skin Tests / Q000662:veterinary*; D015007:Yersinia / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial