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Protection against Mycoplasma hyorhinis infection in commercial pigs via immunization with inactivated vaccines prepared with homologous or heterologous strains

文献类型： 外文期刊

作者： Wang, Jia 1 ; Gan, Yuan 1 ; Yuan, Ting 1 ; Huang, Yuanyuan 1 ; Zhang, Lei 1 ; Wei, Yanna 1 ; Zubair, Muhammad 1 ; Wang, Li 1 ; Chen, Jiayu 1 ; Shao, Guoqing 1 ; Feng, Zhixin 1 ; Xiong, Qiyan 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Vet Med, Key Lab Vet Biol Engn & Technol, Minist Agr & Rural Affairs, Nanjing, Peoples R China

2.Guotai Taizhou Ctr Technol Innovat Vet Biol, Taizhou, Peoples R China

3.Nanjing Agr Univ, Coll Vet Med, Nanjing, Peoples R China

4.Anhui Agr Univ, Coll Anim Sci & Technol, Hefei, Peoples R China

关键词： Mycoplasma hyorhinis; Inactivated vaccine; Cross-protection; Heterologous strain challenge

期刊名称：VACCINE （ 影响因子：3.5； 五年影响因子：3.5 ）

ISSN： 0264-410X

年卷期： 2024 年 42 卷 26 期

页码：

收录情况： SCI

摘要： Mycoplasma hyorhinis is a highly prevalent pathogen in pig farms worldwide, causing polyserositis and polyarthritis, resulting in great economic losses. Previous genotyping and pathogenic studies have revealed significant genetic and antigenic diversity among M. hyorhinis strains. While there are reports on M. hyorhinis vaccine development, the cross-protection between different M. hyorhinis strains has not been clarified. In this study, two M. hyorhinis strains (HEF-16 and JS-54), belonging to different sequence types, were inactivated to produce vaccines. Pigs were vaccinated respectively and subsequently infected with strain HEF-16. The protection against challenge with homologous or heterologous strains was determined and compared. Both vaccinated groups of pigs exhibited a high antibody titer two weeks after the first vaccination, and significant decreases in pathogen load in joints, along with an increase in average daily weight gain compared to the challenged group after M. hyorhinis challenge. Pigs immunized with the HEF-16-derived vaccine showed a significant reduction in joint swelling and lameness, similar to pigs immunized with the JS-54-derived vaccine. At necropsy, animals in the challenged group exhibited moderate-to-severe polyserositis and arthritis, whereas pathological changes were greatly reduced in animals from the vaccinated groups. No significant differences were observed in clinical symptoms nor pathological damages between the two vaccinated groups. Overall, our study demonstrates the effective protection of the inactivated M. hyorhinis vaccines against challenges with homologous or heterologous strains in commercial pigs. This indicates a promising clinical application prospect for inactivated bacterin vaccines in preventing M. hyorhinis-related diseases in pig farms.

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