1. aroA deleted Bordetella bronchiseptica inspiring robust mucosal immune response and provide full protection against intranasal challenge.
- Author
-
Zhang Q, Hu R, Hu J, He H, Tang X, Jin M, Chen H, and Wu B
- Subjects
- Administration, Intranasal veterinary, Animals, Bacterial Proteins genetics, Bacterial Vaccines therapeutic use, Bordetella Infections immunology, Bordetella Infections prevention & control, Bronchoalveolar Lavage Fluid immunology, Bronchoalveolar Lavage Fluid microbiology, Female, Gene Deletion, Immunity, Humoral immunology, Immunoglobulin A analysis, Immunoglobulin A blood, Immunoglobulin A immunology, Lung immunology, Lung microbiology, Mice, Mice, Inbred BALB C, Respiratory Mucosa immunology, Respiratory Mucosa microbiology, Rhinitis, Atrophic immunology, Rhinitis, Atrophic microbiology, Rhinitis, Atrophic prevention & control, Rhinitis, Atrophic veterinary, Swine immunology, Swine microbiology, Swine Diseases immunology, Swine Diseases prevention & control, Vaccines, Attenuated, Bacterial Vaccines immunology, Bordetella Infections veterinary, Bordetella bronchiseptica immunology, Swine Diseases microbiology
- Abstract
Bordetella bronchiseptica is a Gram-negative respiratory pathogen responsible for atrophic rhinitis and bronchopneumonia in swine. Several vaccines aimed at preventing B. bronchiseptica have been used, but a safe and efficient live vaccine for use in piglets remains elusive. In this study, we constructed an aroA-deleted B. bronchiseptica strain (QH0814) and evaluated its safety and protective efficiency in piglets. Lung lesion scores in QH0814-immunized piglets post-challenge were significantly lower than those in piglets immunized with the parent strain (P<0.05). Immunization with QH0814 induced a vigorous immune response, especially at the mucosal surface of the respiratory tract. IgA titers in bronchoalveolar lavage fluid (BALF) and serum were significantly higher in the QH0814-immunized group compared to the inactivated-vaccine-immunized group. Piglets immunized with QH0814 were better protected than those in the inactivated-vaccine and negative control groups. The clinical symptoms, histopathological changes and immune responses elicited in the piglets were recorded. The results of this study suggest that QH0814 was able to confer complete protection against B. bronchiseptica infection and could thus be used as a candidate attenuated live vaccine against B. bronchiseptica in piglets., (Copyright © 2012 Elsevier Ltd. All rights reserved.)
- Published
- 2013
- Full Text
- View/download PDF