China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (11): 4346-4355.doi: 10.16431/j.cnki.1671-7236.2022.11.025

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Construction and Immune Efficacy Evaluation of a Genotype Ⅶ Newcastle Disease Virus Chimeric Vaccine Based on F and HN Proteins

LI Li1,2,3, WANG Guokang1,2,3,4, SHANG Yu1,2,3, XU Yingying1,2,3, FENG Helong1,2,3, WANG Hongcai1,2,3, ZHANG Rongrong1,2,3, ZENG Zhe1,2,3, LUO Qingping1,2,3, SHAO Huabin1,2,3, ZENG Chi4, WEN Guoyuan1,2,3   

  1. 1. Institute of Animal Husbandry and Veterinary, Hubei Academy of Agricultural Sciences, Wuhan 430064, China;
    2. Key Laboratory of Prevention and Control Agents for Animal Bacteriosis, Ministry of Agriculture and Rural Affairs, Wuhan 430064, China;
    3. Hubei Provincial Key Laboratory of Animal Pathogenic Microbiology, Wuhan 430064, China;
    4. School of Biology and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan 430023, China
  • Received:2022-04-01 Online:2022-11-05 Published:2022-11-04

Abstract: 【Objective】 This study was aimed to construct a genotype Ⅶ Newcastle disease virus (NDV) chimeric vaccine, and access its immune efficacy.【Method】 The F and HN protein ectodomains of recombinant plasmid pT7-Y2 of the Avian metaavulavirus-2 (AMAV-2) Y2 strain were replaced with the corresponding F and HN protein ectodomains of genotype Ⅶ NDV HB0901 strain by utilizing reverse genetic technology.Then F protein cleavage site of HB0901 strain was transformed into that of lentogenic LaSota strain, and the chimeric virus was recovered and named rY2-FHNR.The growth characteristics, pathogenicity and genetic stability of rY2-FHNR strain were evaluated, then 2-week-old SPF chickens were immunized with rY2-FHNR to determine the immunogenicity and cross-reactivity between immune serum and Y2 strain.The immune serum was identified by indirect NDV NP ELISA to verify its diagnosis effect.【Result】 Chimeric recombinant virus strain rY2-FHNR was constructed successfully.The biological characteristics results showed that the proliferation titer and pathogenicity in chicken embryos of rY2-FHNR strain were avirulent, while the chimeric virus was genetic stable when serially passaged in chicken embryos.Immunization with rY2-FHNR stimulated antibodies against NDV, and the immune serum had no cross-reactivity with rY2 strain.Through indirect NDV NP ELISA could distinguish infected animals from vaccinated animals.【Conclusion】 This study developed a genotype Ⅶ NDV chimeric vaccine candidate, which could be used as chimeric vaccine, provided technological support for the monitoring, prevention and eradication of genotype Ⅶ NDV.

Key words: Newcastle disease virus (NDV); genotype Ⅶ; Avian metaavulavirus-2(AMAV-2); reverse genetic technology; chimeric vaccine

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