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ARS Home » Midwest Area » Ames, Iowa » National Animal Disease Center » Virus and Prion Research » Research » Publications at this Location » Publication #355533

Research Project: Non-Antibiotic Strategies to Control Priority Bacterial Infections in Swine

Location: Virus and Prion Research

Title: Immunoproteomic detection and in vivo screening of protein targets for control of Glasser's disease in pigs

Author
item Hau, Samantha - Orise Fellow
item Eberle, Kirsten - Orise Fellow
item Nally, Jarlath
item Lippolis, John
item Mou, Kathy - Orise Fellow
item Brockmeier, Susan

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 8/23/2018
Publication Date: 10/8/2018
Citation: Hau, S.J., Eberle, K.C., Nally, J.E., Lippolis, J.D., Mou, K.T., Brockmeier, S. 2018. Immunoproteomic detection and in vivo screening of protein targets for control of Glasser's disease in pigs. MedVet Pathogens 2018 5th Prato Conference on Animnal Bacterial Pathogens, October 8-11, 2018, Prato, Italy. Abstract No. 48.

Interpretive Summary:

Technical Abstract: Haemophilus parasuis, the causative agent of Glasser's disease in pigs, is widespread and results in significant financial losses to the swine industry annually. The majority of vaccines are based on a killed, whole cell platform, in which the immune response tends to be serotype or strain specific and are unable to provide broad cross protection against H. parasuis. This has stimulated interest in the development of subunit vaccines, where the immune response can be directed to highly conserved, surface exposed antigens. Outer membrane proteins (OMPs) with potential protective capability from H. parasuis were identified via 2D gel electrophoresis and Western blotting. Blots were probed with antisera from pigs vaccinated with H. parasuis serovar 5 strain Nagasaki or 265, which did and did not afford heterologous protection to serovar 1 strain 12939, respectively. OMPs recognized by 265 antisera and not recognized by Nagasaki antisera were identified using LC-MS-MS. After verifying conservation, three OMPs were selected for use in a vaccine trial: ApbE, LpoA, and YaeT. These three recombinant OMPs were immunogenic, generating a significant antibody titer; however, OMP vaccinated animals were not protected from homologous (265) or heterologous (12939) challenge. Further investigation into differences between immunity generated by 265 bacterin vaccination and Nagasaki bacterin vaccination is warranted to better understand the immunogens conferring heterologous protection.