ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2018, Vol. 49 ›› Issue (9): 1961-1968.doi: 10.11843/j.issn.0366-6964.2018.09.017

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Development and Preliminary Application of a Blocking ELISA for Detection of Japanese Encephalitis Virus Antibody

JIANG Ya, NIU Ji-chen, NI Hui, WEI Dong-mei, ZHOU Guo-dong, CAO Rui-bing*   

  1. College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
  • Received:2018-04-08 Online:2018-09-23 Published:2018-09-26

Abstract:

Japanese encephalitis is a mosquito transmitted zoonosis caused by Japanese encephalitis virus (JEV) that seriously harms the health of human and animals, such as pigs and horses. In order to establish a specific method for detection the JEV antibody in various animal serum, a blocking ELISA method was established using recombinant EDⅢ protein and horseradish peroxidase (HRP) conjugated JEV specific Monoclonal antibody 1B10. Results were as follows:The percentage of interruption rate (PI) of 100 JEV antibody negative serum samples were statistically analyzed, the cut-off of blocking ELISA was determined as the sample presenting a calculated PI ≥ 34% were considered positive; while samples with a calculated PI ≤ 25% were rated negative; and those presenting PI between 25% and 34% were considered inconclusive. No cross-reaction with antibody positive serum against PCV2, PRV, CSFV, FMDV and PRRSV was observed in the test. And the intra-and inter-assay variation were less than 5%. Compared with the commercialization JEV antibody detection ELISA kit, the agreement rates of the new established blocking ELISA was 97.2%. The specificity and sensitivity of the blocking ELISA were 98.5% and 94.3%, respectively. The blocking ELISA was used to test against 515 serum samples collected from swine, cattle and sheep, among which 74.5%, 13.3% and 9.2% of samples were JEV specific antibody-positive. The detection results of randomly selected swine, cattle and sheep by the serum neutralization test were agree with blocking ELISA. As a result, a blocking ELISA was successfully established for detecting JEV antibody of swine, cattle and sheep in the present study.

Key words: Japanese encephalitis virus, envelope protein, HRP-labeled MAb, blocking ELISA

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