Epidemiology Investigation of Duck Viral Hepatitis in Some Areas of Shandong Province
In order to understand the prevalence of duck virus hepatitis in Shandong,since August 2010 to December 2011,31 suspected duck viral hepatitis samples have heen collected from parts of Shandong and were studied on the incidence investigation,histopathological observation,virus isolation and identification,gene cloning and sequencing analysis.The results inclicated that each region of Shandong has a high proportion of duck viral hepatitis cases.which mainly infected ducks under 4-week-old.Other days-age ducks can also he infected.Though cases were common in autumn,the seasonal feature of the disease is not obvious.It is different from a generally seasonal pattern of morbidity that has a peak in spring.The incidence and mortality of different duck flocks are diversity.The percent of paralysis has risen in clinical symptoms.Necropsy showed that,except characteristic lesions of viral hepatitis,some ducks had petechial hemorrhages on the endocardium and epicardium of the heart and some ducks had serious viral encephalitis lesions.12 samples were DHV in the 31 samples.Among them,11 samples were positive for DHV-Ⅰ(positive rate was 35.84% ),1 sample was positive for DHV-Ⅲ(positive rate was 3.23% ).17 samples were DHBV (positive rate was 54.84% ).There were 4 samples,which were positive for DHV-Ⅰand DHBV.The co-infection rate was 12.90%.Comparied the gene sequences,mutant gene of DHV was less than DHBV.The survey shows that there is multiple hepatitis virus infection in Shandong duck flocks.Duck viral hepatitis incidence has increased.Symptoms and lesions of ill ducks appeared a few new features.These epidemiological changes are not only related to the changes in pathogenicity,may be also affected by appearance of duck TMU disease,mycotoxins and other drug poisoning.
duck viral hepatitis epidemiological survey pathological observation isolation and identification of pathogen
Qu Yajin Zhang Chenwei Zhou Mingdong Li Juan Yu Hong Liu Sidang
Shandong Agricultural University,Taian 271018,China Taian Animal Husbandry and Veterinary Bureau,Taian 271018,China
国际会议
XVIth International Congress on Animal Hygiene(第十六届动物卫生国际会议(ISAH 2013))
南京
英文
61-65
2013-05-05（万方平台首次上网日期，不代表论文的发表时间）