title: Antigenic type-specificity of swine isolates of Streptococcus equisimilis.
abstract: Isolates of a Lancefield Group C organism, Streptococcus equisimilis, of sow reproductive tract and young swine joint origin were found to possess type-specific antigens. Capillary precipitin and immunodiffusion tests, done with acid extracts and cross-absorbed rabbit antisera, revealed four serotypes among 62 of 64 isolates. Extracts of two swine isolates of S. equisimilis and other Lancefield Group C strains including S. equi, S. zooepidemicus and three previously established types of S. equisimilis of human origin did not react with any of the four type-specific sera. Antigens responsible for type-specificity were heat-stable and sensitive to trypsin.
mesh_terms: D000818:Animals; D000942:Antigens, Bacterial; D001170:Arthritis, Infectious / Q000209:etiology / Q000662:veterinary; D000939:Epitopes; D007106:Immune Sera; D005779:Immunodiffusion; D008722:Methods; D008826:Microbial Sensitivity Tests; D011817:Rabbits / Q000276:immunology; D018805:Sepsis / Q000209:etiology / Q000662:veterinary; D012703:Serotyping; D013290:Streptococcal Infections / Q000150:complications / Q000276:immunology* / Q000382:microbiology / Q000662:veterinary; D013291:Streptococcus / Q000276:immunology / Q000302:isolation & purification; D013552:Swine; D013553:Swine Diseases / Q000276:immunology*; D014357:Trypsin
chemical_list: D000942:Antigens, Bacterial; D000939:Epitopes; D007106:Immune Sera; D014357:Trypsin