title: Immunity to Swine dysentery in recovered pigs.
abstract: The immune status of 29 pigs recovered from swine dysentery (SD) was evaluated after reexposure to Treponema hyodysenteriae. Pigs which had recovered from SD and remained asymptomatic for 4 to 6, 9 to 13, and 16 to 17 weeks after initial inoculation were reexposed to 1.5 X 10(9) viable cells of T hyodysenteriae per pig. Pigs which had recovered from SD were not shedding T hyodysenteriae, as determined by selective cultural examination of feces, before they were reexposed. Of 29 pigs reexposed to T hyodysenteriae, 27 were resistant to SD. In contrast, 23 of 28 control pigs developed signs of SD when exposed to T hyodysenteriae for the first time. Significant differences in immunity were not observed between pigs from the three convalescent periods. Serum agglutinins to T hyodysenteriae were present in recovered pigs for approximately 8 weeks after inoculation.
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000032:analysis; D004403:Dysentery / Q000276:immunology / Q000662:veterinary*; D007110:Immunity, Active; D013552:Swine / Q000276:immunology*; D013553:Swine Diseases / Q000276:immunology*; D013997:Time Factors; D014208:Treponema / Q000276:immunology; D014211:Treponemal Infections / Q000276:immunology / Q000662:veterinary*
chemical_list: D000907:Antibodies, Bacterial