title: Cross reactivity among the swine mycoplasmas as identified by protein microarray.
abstract: Mycoplasmas are cell wall-less bacteria that infect a variety of animals in a species-specific manner. In swine, Mycoplasma hyopneumoniae is the most virulent and presents the most disease and economic problems to the swine industry. Serological assays are commonly used to assess colonization and disease, but antigenic cross-reactivity between M. hyopneumoniae and other mycoplasma species, most notably Mycoplasma hyorhinis, Mycoplasma hyosynoviae and Mycoplasma flocculare, is a concern. The extent of cross-reactivity has not been thoroughly investigated. These studies were designed to identify M. hyopneumoniae proteins that are recognized by rabbit hyperimmune sera raised against the other swine mycoplasmas. Our results indicate extensive cross-reactivity between M. flocculare and M. hyopneumoniae, which explains previous reports seen with ELISA assays. Only three of the thirty-nine M. hyopneumoniae proteins tested showed no cross reactivity with the other three swine mycoplasmas, mhp182 (42kDa C-terminal fragment), mhp638 and mhp684 (C-terminal fragment). Two proteins, mhp384 and mhp511, were cross-reactive with hyperimmune sera generated against three of the four species. None of the anti-M. hyorhinis hyperimmune sera reacted to any of the M. hyopneumoniae proteins. These results suggest that inapparent M. flocculare infections could produce positive responses in M. hyopneumoniae serological assays due to cross-reactivity, and that M. hyosynoviae infections are less likely to do so and M. hyorhinis infections unlikely to affect assay results.
authors.affiliation: Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, USA.
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Petersen
authors.affiliation: Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, USA.
authors.forename: David C
authors.initials: DC
authors.lastname: Oneal
authors.affiliation: Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, USA.
authors.forename: Janice R
authors.initials: JR
authors.lastname: Seibel
authors.affiliation: Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, USA.
authors.forename: Kylie
authors.initials: K
authors.lastname: Poel
authors.affiliation: Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, USA.
authors.forename: Courtney L
authors.initials: CL
authors.lastname: Daum
authors.affiliation: The ithree Institute, University of Technology Sydney, Sydney, NSW, Australia.
authors.forename: Steven P
authors.initials: SP
authors.lastname: Djordjevic
authors.affiliation: Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA, USA. Electronic address: fcminion@iastate.edu.
authors.forename: F Chris
authors.initials: FC
authors.lastname: Minion
mesh_terms: D000818:Animals; D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism; D003001:Cloning, Molecular; D003429:Cross Reactions; D009174:Mycoplasma / Q000145:classification* / Q000302:isolation & purification*; D040081:Protein Array Analysis / Q000379:methods*; D013045:Species Specificity; D013552:Swine / Q000382:microbiology*
chemical_list: D001426:Bacterial Proteins
keywords: Cross-reactive antigens; Protein microarrays; Serology; Swine mycoplasmas