title: Comparative virulence of clinical Brachyspira spp. isolates in inoculated pigs.
abstract: Classical swine dysentery is associated with the presence of the strongly beta-hemolytic Brachyspira hyodysenteriae. However, multiple Brachyspira spp. can colonize the porcine colon. Since 2008, several Brachyspira spp. not identified as B. hyodysenteriae by genotypic and/or phenotypic methods have been isolated from the feces of pigs with clinical disease typical of swine dysentery. In the current study, 8 clinical isolates, including 5 strongly beta-hemolytic and 3 weakly beta-hemolytic Brachyspira strains, and a reference strain of B. hyodysenteriae (B204) were inoculated into pigs (n = 6 per isolate) to compare pathogenic potential following oral inoculation. Results revealed that strongly beta-hemolytic isolates induced significantly greater typhlocolitis than those that are weakly beta-hemolytic, regardless of the genetic identification of the isolate, and that strongly beta-hemolytic isolates identified as "Brachyspira sp. SASK30446" and Brachyspira intermedia by polymerase chain reaction (PCR) produced lesions similar to those caused by B. hyodysenteriae. The results suggest that phenotypic culture characteristics of Brachyspira spp. may be a more sensitive indicator of potential to induce dysentery-like disease in pigs than molecular identification alone based on currently available PCR assays. Additionally, culture of mucosal scrapings obtained at necropsy was more sensitive than direct PCR on the same samples for detection of Brachyspira spp.
authors.affiliation: Departments of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, USA. burrough@iastate.edu
authors.forename: Eric R
authors.initials: ER
authors.lastname: Burrough
authors.forename: Erin L
authors.initials: EL
authors.lastname: Strait
authors.forename: Joann M
authors.initials: JM
authors.lastname: Kinyon
authors.forename: Leslie P
authors.initials: LP
authors.lastname: Bower
authors.forename: Darin M
authors.initials: DM
authors.lastname: Madson
authors.forename: Bailey L
authors.initials: BL
authors.lastname: Wilberts
authors.forename: Kent J
authors.initials: KJ
authors.lastname: Schwartz
authors.forename: Timothy S
authors.initials: TS
authors.lastname: Frana
authors.forename: J Glenn
authors.initials: JG
authors.lastname: Songer
mesh_terms: D000818:Animals; D017400:Brachyspira / Q000145:classification* / Q000472:pathogenicity*; D003967:Diarrhea / Q000382:microbiology / Q000473:pathology / Q000662:veterinary; D016905:Gram-Negative Bacterial Infections / Q000382:microbiology / Q000473:pathology / Q000662:veterinary*; D013552:Swine; D013553:Swine Diseases / Q000382:microbiology* / Q000473:pathology; D014774:Virulence