Acta Veterinaria et Zootechnica Sinica ›› 2023, Vol. 54 ›› Issue (5): 2062-2072.doi: 10.11843/j.issn.0366-6964.2023.05.027

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Establishment and Preliminary Application of Indirect ELISA Method and HI Test for Detection of Mycoplasma Gallisepticum Antibody

CHEN Yang1, MENG Linchun1, GUO Mengjiao1, ZHANG Chengcheng1, BO Zongyi2, CHU Dianfeng3, CAO Yongzhong2, WU Yantao1,2, ZHANG Xiaorong1*   

  1. 1. Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, College of Veterinary Medicine, Yangzhou University, Yangzhou 225009, China;
    2. International Research Laboratory of Agriculture and Agri-Product Safety, Institutes of Agricultural Science and Technology Development, Yangzhou University, Yangzhou 225009, China;
    3. State Key Laboratory of Genetically Engineered Veterinary Vaccines, Qingdao Yebio Biological Engineering Co., Ltd, Qingdao 266114, China
  • Received:2022-09-13 Online:2023-05-23 Published:2023-05-20

Abstract: This study aimed at establishing an indirect-ELISA method for the titer detection of Mycoplasma gallisepticum (MG) antibodies in chicken, which could provide a set of effective technology for large-scale clinical monitoring of MG infection combined with HI test established. Prokaryotic-expressed protein VlhA3.03 (rVlhA) was obtained as envelope antigen. The linear equation lg (antibody titer)=1.257×lg (S/P value at 1:500) +3.709 of serum antibody titer and S/P value at 1:500 was established by a single serum dilution test and the correlation coefficient (R2) was 0.917 6. The cutoff value of negative and positive S/P was determined to be 0.32, and the corresponding titer is 1 200. The rVlhA-ELISA showed good specificity and repeatability. The detection limit of MG positive sera is 1:2 000. An HI assay was also established using domestic MG isolate SH/2020-1 as hemagglutination inhibition test antigen. The combined rVlhA-ELISA method and HI test, and IDEXX-MG were compared in serum sample detection, with RT-qPCR method to monitor MG infection. The results showed that the trend of serum antibody monitored by rVlhA-ELISA and IDEXX-MG was consistent with the result of HI assay. The coincidence rate between combined rVlhA-ELISA and HI, and IDEXX-MG was 91.53%. These results indicated that the rVlhA-ELISA and HI test established in this study were beneficial to clinical application, which can be applied to large-scale and rapid clinical screening of MG infection and recheck the results.

Key words: Mycoplasma gallisepticum, variable lipoprotein haemagglutinin, antibody detection, indirect enzyme-linked immunosorbent assay

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