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Type of publication: Journal Article
Type of document: Full Paper

Year: 2015

Authors: Koinig, HC; Talker, SC; Stadler, M; Ladinig, A; Graage, R; Ritzmann, M; Hennig-Pauka, I; Gerner, W; Saalmüller, A

Title: PCV2 vaccination induces IFN-γ/TNF-α co-producing T cells with a potential role in protection.

Source: Vet Res. 2015; 46:20

Authors Vetmeduni Vienna:

Gerner Wilhelm
Graage Robert
Hennig-Pauka Isabel
Koinig Hanna
Ladinig Andrea
Ritzmann Mathias
Saalmüller Armin
Stadler Maria
Talker Stephanie

Vetmed Research Units
Institute of Immunology
University Clinic for Swine

Project(s): Preventive Veterinary Medicine

Porcine circovirus type 2 (PCV2) is one of the economically most important pathogens for swine production worldwide. Vaccination is a powerful tool to control porcine circovirus diseases (PCVD). However, it is not fully understood how PCV2 vaccination interacts with the porcine immune system. Especially knowledge on the cellular immune response against PCV2 is sparse. In this study we analysed antigen-specific T cell responses against PCV2 in a controlled vaccination and infection experiment. We focused on the ability of CD4(+) T cells to produce cytokines using multicolour flow cytometry (FCM). Vaccination with a PCV2 subunit vaccine (Ingelvac CircoFLEX®) induced PCV2-specific antibodies only in five out of 12 animals. Conversely, vaccine-antigen specific CD4(+) T cells which simultaneously produced IFN-γ and TNF-α and had a phenotype of central and effector memory T cells were detected in all vaccinated piglets. After challenge, seroconversion occurred earlier in vaccinated and infected pigs compared to the non-vaccinated, infected group. Vaccinated pigs were fully protected against viremia after subsequent challenge. Therefore, our data suggests that the induction of IFN-γ/TNF-α co-producing T cells by PCV2 vaccination may serve as a potential correlate of protection for this type of vaccine.

Keywords Pubmed: Animals
CD4-Positive T-Lymphocytes/metabolism
Circoviridae Infections/immunology
Circoviridae Infections/veterinary*
Circoviridae Infections/virology
Flow Cytometry/veterinary
Immunity, Cellular*
Immunity, Humoral*
Polymerase Chain Reaction/veterinary
Swine Diseases/immunology*
Swine Diseases/virology
Tumor Necrosis Factor-alpha/metabolism
Vaccines, Subunit/immunology
Viral Load/veterinary
Viral Vaccines/immunology*

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