A H5N2 subtype avian influenza virus isolated from goose belongs to highly pathogenic avian influenza virus, and the intravenous pathogenicity indexes (IVPI) =2.99. But ducks are not sensitive to this isolated influenza virus. The virus can infect mouse but only replicates in lung and has no pathogenicity. HA and NA gene of this isolated strain share 99.4% and 99.8% nucleotide sequence identity to the HA gene of A/chicken/Hubei/ 489/2004 (H5N1) and the NA gene of A/chicken/Jilin/53/01 (H9N2), and share 99.3% and 99.6% amino acid sequence identity to the HA protein of A/chicken/Hubei/489/2004 (H5N1), A/swan/Guangxi/307/2004 (H5N1), A/wild duck/ Guangdong/314/2004(H5N1), A/chicken/Henan/210/2004(H5N1) and the NA protein of A/chicken/ Jilin/53/01 (H9N2). There are several continuous basic amino acids (-RRRKKR-) at the cleavage site of HA protein. Phylogenetic trees analysis of HA and NA gene suggests that the isolated influenza virus probably originated from the reassortment of H5N1 and H9N2 subtype influenza virus.

In recent years, Hepatitis B virus (HBV) persistent infection mouse model with recombinant adeno-associated virus 8 carrying 1.3 copies of HBV genome (rAAV8-1.3HBV) is concerned. We studied and compared the efficacy among HBV persistent infection mice models by other serotypes except AAV8. First, we prepared and purified five viruses: rAAV1-1.3HBV, rAAV2-1.3HBV, rAAV5-1.3HBV, rAAV8-1.3HBV and rAAV9-1.3HBV. Then we injected each virus into 3 C57BL/6J mice with the dose of lx 1011 vg (Viral genome, vg) per mouse. We detected HBsAg and HBeAg in sera by enzyme-linked immunosorbent assay (ELISA) at different time points post injection. We killed mice 8 weeks post injection and took blood and livers for assay. We detected copies of HBV DNA by real-time quantitative PCR in sera and livers. Meantime, we detected HBcAg in the livers of mice by immunohistochemistry and further performed pathology analysis of these livers. The five groups of mice, HBeAg and HBsAg expression sustained 8 weeks in serological detection and HBV DNA was both detected in sera and livers at the time of 8 weeks post injection. HBeAg, HBsAg, HBV DNA copies expression levels in descending order were AAV8>AAV9>AAV1>AAV5>AAV2. HBcAg expression was detected in livers as well. Varied degrees of liver damage were shown in five groups of mice. This study provides more alternative AAV vector species to establish a persistent infection with hepatitis B model.
Animals ; Dependovirus ; classification ; Disease Models, Animal ; Enzyme-Linked Immunosorbent Assay ; Genetic Vectors ; Genome, Viral ; Hepatitis B ; virology ; Hepatitis B Core Antigens ; metabolism ; Hepatitis B Surface Antigens ; blood ; Hepatitis B e Antigens ; blood ; Hepatitis B virus ; genetics ; Mice ; Mice, Inbred C57BL ; Serogroup ; Virus Replication

This study was aimed to establish an HPLC method for simultaneous content determination of valtrate, acevaltrate, and their degradation products, which were baldrinal and 11-ethoxyviburtinal, in Valeriana jatamansi Jones. The separation and quantification of 4 constituents mentioned above were performed on an Agilent ZORBAX SB-C18 (4.6 mm×250 mm, 5 μm). The mobile phase consisted of water (A) - acetonitrile (B) with an optimized gradient program. The flow rate was 1 mL·min-1. The column temperature was set at 25℃. The wavelength was set at 241 nm. And the injection volume was 10μL. The results showed that among 14 different places of V. jatamansi, the 4 contents determined were different. The contents of valtrate, acevaltrate, and baldrinal in the Yunnan Baoshan Mount were the highest. And the content of 11-ethoxyviburtinal was the highest in Yunnan Dali. It was concluded that the method was with good precision, reproducibility and stability. And it was suitable for the determination of 4 valepotriates ingredients in V. jatamansi. It also provided references for the quality control and exploitation of V. jatamansi.

Objective To understand the situation of knowledge,attitude and practice (KAP) of sheep farmers and field veterinarians towards brucellosis prevention,and find out the potentially influential factors.Methods From March to September in 2017,1 067 sheep farmers and 401 field veterinarians were selected as participates,and questionnaire survey was carried out.Percentage rate was used to describe the situation of KAP.Nonparametric test was used to compare the KAP score difference.Results The overall awareness in sheep farmers and field veterinarians was 64.2％ and 80.1％,respectively.In addition,there were 17.3％ (185/1067) sheep farmers and 12.2％ (49/401) field veterinarians had never heard of brucellosis.The knowledge awareness in sheep farmers and field veterinarians was 62.6％ and 79.0％,respectively,75.8％ and 83.8％ of them had positive attitude to brucellosis prevention,54.1％ and 77.6％ of them had good practice habit.They hoped in the future,more information could be received through TVs,and then was internet or broadcasting.Sheep farmers who from first class region,age less than 45 years,education higher than junior high school,feeding time less than 5 years and sheep ever infected with brucellosis (U =4.85,3.08,3.29,2.20,6.62,P ＜ 0.05 or ＜ 0.01),had higher KAP scores than others.Field veterinarians,who had lower education,had lower KAP scores (U =4.29,P ＜ 0.01).Conclusions The awareness of sheep farmers and field veterinarians still need to improve and strengthen.Some suggestions are put forward:improve intervention pattern,optimize content and method,pay attention to use new media.