China Animal Husbandry and Veterinary Medicine ›› 2024, Vol. 51 ›› Issue (3): 1183-1193.doi: 10.16431/j.cnki.1671-7236.2024.03.030

• Preventive Veterinary Medicine • Previous Articles    

Diagnosis and Pathogen Analysis of Co-infection of Goose Parvovirus, GenotypeⅠ Goose Astrovirus and Riemerella anatipestifer

ZHANG Xiaozhan1, XING Zhongyu1, LYU Nannan1, DONG Xuanzhi1, LI Yulin1, MAO Tianji1, LIANG Yaohan1, GUO Yunze1, SONG Yuzhen1, QIAO Hongxing1, BIAN Chuanzhou1, YUAN Ye2, LIANG Qunchao3   

  1. 1. College of Veterinary Medicine, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China;
    2. Zhengzhou Biopharmaceutical Factory, Qianyuanhao Biological Co., Ltd., Zhengzhou 450048, China;
    3. Henan Yinji Jiabao Amusement Park Management Co., Ltd., Zhengzhou 450000, China
  • Received:2023-09-01 Published:2024-02-27

Abstract: 【Objective】 In April 2023,an acute outbreak of infectious disease in goslings with mortality up to 25% occurred in a commercial goose farm in Xinxiang city of Henan province.To determine the potential causative agent of this disease,anatomical examination and laboratory pathogen diagnosis of dead goslings were performed.【Method】 The tissue samples of livers,spleen,kidneys,small intestine and cardiac blood and fibrous exudate from the outer layer of the liver were collected.Bacterial isolation and cultivation,Gram staining microscopy observation,16S rRNA gene identification and drug sensitivity testing were performed on samples of cardiac blood and fibrous exudate from the outer layer of the liver to determine the bacterial infection and drug sensitivity of infected geese. PCR/RT-PCR method was used to test the nucleic acid of common gosling viral infectious disease pathogens,and sequencing analysis was performed on the main structural protein genes of positive pathogens to determine the viral pathogens and their molecular epidemiology in infected geese.【Result】 In the bacterial test,the results showed that the isolated bacteria could grow as the morphology of translucent,neat edges,smooth colonies on blood agar medium.Gram-negative single and paired bacteria could be observed after Gram staining,which were consistent with the characteristics of Riemerella anatipestifer (RA).PCR amplification of 16S rRNA gene and BLAST analysis were further confirmed the isolate was RA.The drug sensitivity test revealed that the RA strain was highly sensitive to ceftriaxone and cefotaxime,and resistance to amoxicillin,tetracycline and polymyxin B. PCR and RT-PCR detection results for the common pathogens of goslings showed that all the samples were positive for Goose parvovirus (GPV) and genotype Ⅰ Goose astrovirus (GAstV-1), and no corresponding nucleotide fragments were observed for GAstV-2,Avian influenza virus (AIV) and Goose reovirus (GRV). The two identified virus strains were designated as GPV/HN-2023 and GAstV-1/HN-2023,respectively.Furthermore,the analysis of the main structral protein gene of GPV/HN-2023 and GAstV-1/HN-2023 revealed that GPV/HN-2023 was closely related to DY-16 strain and belonged to DY-16-like strain,with two unique amino acid mutations D248E and V314L in VP3 protein.GAstV-1/HN-2023 was closely related to GAstV-1 strains and grouped into GAstV-1 branch,with three unique amino acid mutations G47R,S207G and A628T in ORF2 protein.【Conclusion】 This study identified the mixed infection of GPV,GAstV-1,and RA as the cause of gosling disease in the goose farm through comprehensive diagnostic methods.The drug resistance of pathogenic bacteria RA and the genetic evolution and variation characteristics of viral pathogens GPV and GAstV-1 were analyzed,providing theoretical reference for the scientific prevention and control of gosling disease in Henan region.

Key words: Goose parvovirus (GPV); genotypeⅠ Goose astrovirus (GAstV-1); Riemerella anatipestifer; co-infection; etiology analysis

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