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Bovine Herpesvirus-4 Based Vaccine Provides Protective Immunity against <i>Streptococcus suis</i> Disease in a Rabbit Model
oleh: Nihua Dong, Hester Nichols, Qing Sun, Xiaojun Chen, Jiayang Zheng, Zhixin Guan, Hailong Zhang, Andrew Davison, Yvonne Wezel, Zongjie Li, Beibei Li, Ke Liu, Donghua Shao, Yafeng Qiu, Jianhe Sun, Xiangdong Li, Mathew Upton, Zhiyong Ma, Michael A. Jarvis, Jianchao Wei
Format: | Article |
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Diterbitkan: | MDPI AG 2023-05-01 |
Deskripsi
<i>Streptococcus suis</i> (<i>S. suis</i>) is a bacterial pathogen of pigs that has a major animal health and economic impact on the pig industry. Bovine herpesvirus-4 (BoHV-4) is a new virus-based vaccine vector that has been used for the immunogenic delivery of antigens from a variety of pathogens. In the present study, two recombinant BoHV-4-based vectors were evaluated for their ability to induce immunity and protection against <i>S. suis</i> in a rabbit model. The GMD protein is a fusion protein consisting of multiple dominant B-cell epitopes ((B-cell dominant epitopes of GAPDH, MRP, and DLDH antigens) (BoHV-4/GMD)) and the second suilysin (SLY) (BoHV-4/SLY) from <i>S. suis</i> serotype 2 (SS2). Both GMD and SLY delivered by the BoHV-4 vectors were recognized by sera from SS2-infected rabbits. The vaccination of rabbits with the BoHV-4 vectors induced antibodies against SS2, as well as against additional <i>S. suis</i> serotypes, SS7 and SS9. However, sera from BoHV-4/GMD-vaccinated animals promoted a significant level of phagocytic activity by pulmonary alveolar macrophages (PAMs) against SS2, SS7, and SS9. In contrast, sera from rabbits immunized with BoHV-4/SLY induced PAM phagocytic activity against only SS2. In addition, BoHV-4 vaccines differed in the associated level of protection against lethal SS2 challenge, which ranged from high (71.4%) to low (12.5%) for BoHV-4/GMD and BoHV-4/SLY, respectively. These data suggest BoHV-4/GMD as a promising vaccine candidate against <i>S. suis</i> disease.