China Animal Husbandry and Veterinary Medicine ›› 2023, Vol. 50 ›› Issue (3): 1177-1184.doi: 10.16431/j.cnki.1671-7236.2023.03.032

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Effect of Astragalus Polysaccharides on Inactivated Aeromonas hydrophila Vaccine for Hybrid Sturgeon

LIU Xin1, PAN Jimai2, HU Andong3, ZENG Chengrong1, YANG Ying1,4, CHENG Zhentao1,4, CHEN Jiangfeng1,4, JIANG Haibo1,4, WEN Ming1,4   

  1. 1. College of Animal Science, Guizhou University, Guiyang 550025, China;
    2. Qiannan Prefecture Animal Disease Prevention and Control Center, Duyun 558000, China;
    3. Xifeng County Agriculture and Rural Bureau, Xifeng 551100, China;
    4. Guizhou Engineering Research Center for Animal Biological Products, Guiyang 550025, China
  • Received:2022-06-22 Online:2023-03-05 Published:2023-03-02

Abstract: 【Objective】 The purpose of this study was to investigat the effect of Astragalus polysaccharide on inactivated vaccine against Aeromonas hydrophila on hybrid sturgeon,so as to explore the potential of Astragalus polysaccharide as a vaccine adjuvant.【Method】 A total of 140 healthy hybrid sturgeon were randomly divided into four groups (control group,vaccine group,Astragalus polysaccharide group and combined group) and subjected to corresponding immune treatment.Blood samples were collected on days 0,7,14,21 and 28,the antioxidant indexes (superoxide dismutase (SOD)) and immune related index (lysozyme (LYZ),acid phosphatase (ACP),immunoglobulin M (IgM) and complement C3(C3)) were detected.At the end of immunization,the virus challenge test was conducted to observe the death of sturgeon and the pathological changes of immune tissues.【Result】 On days 0,7,14,21 and 28,compared with control group,the activities of SOD,LYZ and ACP,and the contents of IgM and C3 in the serum of hybrid sturgeon in combined and vaccine groups were increased significantly or extremely significantly (P<0.05 or P<0.01).The serum SOD and LYZ activities,and IgM and C3 contents in Astragalus polysaccharide group were increased significantly or extremely significantly (P<0.05 or P<0.01),while the LYZ activity was no significant difference (P>0.05).Compared with vaccine group,the activities of LYZ and ACP in serum of Astragulus polysaccharides group were significantly decreased (P<0.05),the activity of SOD,and the contents of IgM and C3 were no significant difference(P>0.05).Compared with Astragalus polysaccharide group or vaccine groups,the serum SOD,LYZ and ACP activities in combined group were significantly increased (P<0.05),the IgM content was significantly decreased (P<0.05),and the C3 content was no significant difference (P >0.05).The combination of Astragalus polysaccharide and inactivated vaccine could effectively enhance the disease resistance of hybrid sturgeon,and the relative immune protection rate reached 100%. There was no obvious pathological damage to the liver,spleen and intestinal tissue of hybrid sturgeon.【Conclusion】 When Astragalus polysaccharide was combined with Aeromonas hydrophila inactivated vaccine for hybird sturgeon,it could effectively improve the antibody titer of the vaccine and enhance the protection after the inactivated vaccination,which inducing the immune response of hybird sturgeon and improving the disease resistance,and providing a theoretical reference for the prevention and control of fish diseases caused by Aeromonas hydophila.

Key words: Astragalus polysaccharides; Aeromonas hydrophilic; inactivated vaccines; hybrid sturgeon

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