畜牧兽医学报 ›› 2016, Vol. 47 ›› Issue (7): 1435-1442.doi: 10.11843/j.issn.0366-6964.2016.07.017

• 预防兽医 • 上一篇    下一篇

猪圆环病毒2型合并感染脑心肌炎病毒对仔猪的致病性分析

常洪涛1# ,刘慧敏2# ,李永涛1,贺秀媛1,赵军1,陈陆1,王新卫1,杨霞1,王川庆1*   

  1. (1.河南农业大学牧医工程学院,郑州 450002;2.河南农业大学生命科学学院,郑州 450002)
  • 收稿日期:2015-07-25 出版日期:2016-07-23 发布日期:2016-07-23
  • 通讯作者: 王川庆,博士,教授,E-mail:wchuanq@163.com
  • 作者简介:常洪涛(1978-),男,河南虞城人,副教授,博士,主要从事动物传染病免疫防治研究,E-mail:ndcht@163.com。常洪涛和刘慧敏并列第一作者
  • 基金资助:

    河南省高校科技创新团队支持计划(14IRTSTHN015);国家自然科学基金(31272567)

Analysis of Pathogenicity in Piglets Concurrent Infection with Encepholomyocarditis Virus under Immunosuppression Caused by Porcine Circovirus Type 2

CHANG Hong-tao 1# ,LIU Hui-min 2# ,LI Yong-tao 1,HE Xiu-yuan 1,ZHAO Jun 1,CHEN Lu 1,WANG Xin-wei 1,YANG Xia 1,WANG Chuan-qing 1*   

  1. (1.College of Animal Husbandry and Veterinary,Henan Agricultural University,Zhengzhou 450002,China;2.College of Life Science,Henan Agricultural University,Zhengzhou 450002,China)
  • Received:2015-07-25 Online:2016-07-23 Published:2016-07-23
  • Supported by:
     

摘要:

旨在研究猪圆环病毒2型(PCV-2)感染仔猪后造成免疫抑制条件下,探索合并感染脑心肌炎病毒(EMCV)对仔猪的生长性能影响和致病性分析。选取16头健康仔猪设计了EMCV攻毒组、PCV-2攻毒组、PCV-2/EMCV联合攻毒组和对照组,通过临床表现、组织病理学检测、生长性能、免疫指标以及排毒情况等多方面评价,对二者合并感染仔猪的影响进行了研究。结果显示,2种病毒单独感染后,均表现出各自的典型临床特征,危害均不严重。但合并感染后死亡率迅速上升,平均日增重显著降低,体重负增长率升高,心肌和脑组织变性、坏死更为严重,血液中淋巴细胞比率始终较低,EMCV中和抗体较长时间维持在低水平。EMCV排毒期可持续至感染后第12 天,略长于EMCV单独攻毒组的第9天。研究结果证实,PCV-2先期感染可使EMCV对仔猪表现出更为严重的致病性和致死性,免疫功能降低,并可能使得EMCV在猪体内的复制、排毒能力增强。

Abstract:

The objective of our research was to evaluate the growth performance and pathogenicity of piglets concurrent infection with porcine encepholomyocarditis virus (EMCV) under immunosuppression condition caused by porcine circovirus type 2 (PCV-2).Sixteen piglets were chosen for three challenge groups including EMCV,PCV-2 and concurrent infection with PCV-2 and EMCV,and control group.The effect of concurrent infection on piglets was conducted by the relevant indexes including clinical symptoms,pathological examinations,growth performances,immune index,detoxification and so on.The results indicated that the groups infection only with EMCV or PCV-2 showed their own classical clinical characteristic and minimal injury.However,the mortality rate of concurrent infection increased rapidly,the average daily weight gain decreased significantly,degeneration and necrosis in myocardium and brain tissues was more severe,the lymphocyte ratio in the blood still remained low and the neutraliz-ation antibody of EMCV maintained at a low level in a long time.The piglets shed virus lasted 12 days after infection,longer than the group infected only with EMCV for 9 days.The results showed that PCV-2 early infection can promote more severe pathogenicity and lethality,and lower immunity in piglets induced by EMCV,and the ability of virus replication and detoxification in piglets enhanced.

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