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| 1 | Phylogenetic and genetic characterization of a 2017 clinical isolate of H7N9 virus in Guangzhou,China during the fifth epidemic wave显示文摘Pathogenic H7N9 influenza viruses continue to pose a public health concern. The H7N9 virus has caused five outbreak waves of human infections in China since 2013. In the present study, a novel H7N9 strain(A/Guangdong/8 H324/2017) was isolated from a female patient with severe respiratory illness during the fifth wave of the 2017 H7N9 epidemic. Phylogenetic analysis showed that the H7N9 viruses collected during the fifth wave belong to two different lineages: the Pearl River Delta lineage and the Yangtze River Delta lineage. The novel isolate is closely related to the Pearl River Delta H7N9 viruses, which were isolated from patients in Guangdong Province. The novel H7N9 isolate has an insertion of three basic amino acids in the cleavage site of hemagglutinin(HA), which may enhance virulence in poultry. The 2017 isolate also possesses an R292 K substitution in the neuraminidase(NA)protein, which confers oseltamivir resistance. This study highlights the pandemic potential of the novel H7N9 virus in mammals;thus, future characterization and surveillance is warranted. | Yongqiang Deng Chunlin Li Jianfeng Han Yingfen Wen Jian Wang Wenxing Hong Xiaofeng Li Zhongyu Liu Qing Ye Jing Li Changshuai Zhou Lei Yu Chengfeng Qin Fuchun Zhang Tao Jiang | 2017 | Science China(Life Sciences)2017，60，12： | 9 |
| 2 | Distribution of airborne SARS-CoV-2 and possible aerosol transmission in Wuhan hospitals, China显示文摘The novel severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)has caused an outbreak of CO V ID-19(2019 coronavirus infectious disease)that has led to a global public health crisis.The spread of SARS-CoV-2 can be rapid;but there is still considerable controversy about its main route of transmission[l,2];that is,whether transmission is by contact or through the air[2,3].Recently the W H O(World Health Organization)released a document that recognized the possibility of aerosol transmission of SARS-CoV-2 for indoor environments and enclosed spaces[4].The purpose of the present study was to evaluate the airborne transmission of SARS-CoV-2 through a field investigation of its occurrence in the air and other samples collected from health facilities in W uhan;China. | Jia Hu Chengfeng Lei Zhen Chen Weihua Liu Xujuan Hu Rongjuan Pei Zhengyuan Su Fei Deng Yu Huang Xiulian Sun Junji Cao Wuxiang Guan | 2020 | National Science Review2020，7，12： | 4 |
| 3 | Autographa Californica Multiple Nucleopolyhedrovirus orf13 Is Required for Efficient Nuclear Egress of Nucleocapsids显示文摘Autographa californica multiple nucleopolyhedrovirus(Ac MNPV)orf13(ac13)is a conserved gene in all sequenced alphabaculoviruses.However,its function in the viral life cycle remains unknown.In this study,we found that ac13 was a late gene and that the encoded protein,bearing a putative nuclear localization signal motif,colocalized with the nuclear lamina.Deletion of ac13 did not affect viral genome replication,nucleocapsid assembly or occlusion body(OB)formation,but reduced virion budding from infected cells by approximately 400-fold compared with the wild-type virus.Deletion of ac13 substantially impaired the egress of nucleocapsids from the nucleus to the cytoplasm,while the OB morphogenesis was unaffected.Taken together,our results indicated that ac13 was required for efficient nuclear egress of nucleocapsids during virion budding,but was dispensable for OB formation. | Xingang Chen Xiaoqin Yang Chengfeng Lei Fujun Qin Xiulian Sun Jia Hu | 2021 | Virologica Sinica2021，36，5： | 0 |
| 4 | Development of a rapid neutralizing antibody test for SARS-CoV-2 and its application for neutralizing antibody screening and vaccinated serum testing显示文摘Background:Since the outbreak of coronavirus disease(COVID-19),the high infection rate and mutation fre-quency of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),the causative agent,have contributed to the ongoing global pandemic.Vaccination has become the most effective means of controlling COVID-19.Tra-ditional neutralizing tests of sera are complex and labor-intensive,therefore,a rapid test for detecting neutralizing antibodies and antibody status post-immunization is needed.Methods:Based on the fact that antibodies exhibit neutralizing activity by blocking the binding of the S protein receptor-binding domain(S-RBD)to ACE2,we developed a rapid neutralizing antibody test,ACE2-Block-ELISA.To evaluate the sensitivity and specificity,we used 54 positive and 84 negative serum samples.We also tested the neutralizing activities of monoclonal antibodies(mAbs)and 214 sera samples from healthy individuals im-munized with the inactivated SARS-CoV-2 vaccine.Results:The sensitivity and specificity of the ACE2-Block ELISA were 96.3%and 100%,respectively.For neu-tralizing mAb screening,ch-2C5 was selected for its ability to block the ACE2-S-RBD interaction.A plaque assay confirmed that ch-2C5 neutralized SARS-CoV-2,with NT 50 values of 4.19,10.63,and 1.074μg/mL against the SARS-CoV-2 original strain,and the Beta and Delta variants,respectively.For the immunized sera samples,the neutralizing positive rate dropped from 82.14%to 32.16%within 4 months post-vaccination.Conclusions:This study developed and validated an ACE2-Block-ELISA to test the neutralizing activities of an-tibodies.As a rapid,inexpensive and easy-to-perform method,this ACE2-Block-ELISA has potential applications in rapid neutralizing mAb screening and SARS-CoV-2 vaccine evaluation. | Yuchang Li Mingyue Wang Hongzhen Wu Hui Zhao Lei Dong Yunfei Li Xiaofeng Li Ying Tang Sen Zhang Jing Li Chengfeng Qin Tao Jiang Yongqiang Deng Xiaoping Kang | 2022 | Infectious Medicine2022，1，2： | 0 |
| 5 | Characteristic Class of Isotopy for Surfaces显示文摘It is an important problem in topology to verify whether two embeddings are isotopic.This work proposes an algorithm for computing Haefliger-Wu invariants for isotopy based on algebraic topological methods.Given a simplicial complex embedded in the Euclidean space,the deleted product of it is the direct product with diagonal removed.The Gauss map transforms the deleted product to the unit sphere.The pull-back of the generator of the cohomology group of the sphere defines characteristic class of the isotopy of the embedding.By using Mayer Vietoris sequence and Ku¨nneth theorem,the computational algorithm can be greatly simplified.The authors prove the ranks of homology groups of the deleted product of a closed surface and give explicit construction of the generators of the homology groups of the deleted product.Numerical experimental results show the efficiency and efficacy of the proposed method. | REN Yuxue WEN Chengfeng ZHEN Shengxian LEI Na LUO Feng GU David Xianfeng | 2020 | Journal of Systems Science & Complexity2020，33，6： | 0 |
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