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isolation and oral immunogenicity assessment of porcine epidemic diarrhea virus NH-TA2020 strain:One of the predominant strains circulating in China from 2017 to 2021

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Virologica Sinica 2022年第5期37卷 646-655页

作者： Xiaowen Li Yang Li Jiapei Huang Yali Yao Wenying Zhao Yunjing Zhang Jie Qing Jing Ren Zhong Yan Zewei Wang Xiaofang Hu Duli Kang Hongqiang Liu Zhichun Yan New Hope Liuhe Co. Ltd.Chengdu610041China National Research Center for Veterinary Medicine Luoyang471000China Shandong New Hope Liuhe Agriculture and Animal Husbandry Technology Co. Ltd.(NHLH Academy of Swine Research)Dezhou253034China Swine Health Data and Intelligent Monitoring Project Laboratory Dezhou UniversityDezhou253011China Pulike Biological Engineering Inc. Luoyang471000China

Porcine epidemic diarrhea(PED)caused by porcine epidemic diarrhea virus(PEDV)is one of the most devastating diseases in the global pig industry due to its high mortality rate in piglets.Maternal vaccines can effectively enhance the gut-mammary gland-secretory IgA axis to boost lactogenic immunity and passive protection of nursing piglets against PEDV challenge.From 2017 to 2021,we collected 882 diarrhea samples from 303 farms in China to investigate the epidemiology of PEDV.The result showed that about 52.15%(158/303)of the farms were positive for PEDV with an overall detection rate of 63.95%(564/882)of the samples.The S1 fragments of S gene from 104 strains were sequenced for the phylogenetic analysis.A total of 71 PEDV strains(68.27%)sequenced in this study were clustered into the predominant G2c subgroup,while the newly-defined G2d strains(9.62%)were identified in three provinces of China.The NH-TA2020 strain of G2c subgroup was isolated and cultured,and its infection to piglets caused watery diarrhea within 24 h,indicating its strong pathogenicity.Oral administration of NH-TA2020 strain to pregnant gilts stimulated high levels of IgA antibody in colostrum.The piglets fed by the gilts above were challenged with NH-TA2020 strain or CH-HeB-RY-2020 strain from G2d subgroup,and the clinical symptoms and virus shedding were significantly reduced compared to the mock group.Our findings suggest that G2c subgroup is the predominant branch circulating in China from 2017 to 2021.Oral administration of NH-TA2020 enhances maternal IgA and lactogenic immune responses,which confer protection against the homologous and emerging G2d PEDV strains challenges in neonates.

关键词： Porcine epidemic diarrhea virus(PEDV) Molecular epidemiological investigation Virus isolation Lactogenic immune IgA

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Laboratory diagnosis of nonpolio enteroviruses:A review of the current literature

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Biosafety and Health 2023年第2期5卷 112-119页

作者： Tarek Itani Vladislav Chalapa Aleksandr Semenov Aleksandr Sergeev Yekaterinburg Research Institute of Viral Infections SRC VB VEKTORRospotrebnadzorYekaterinburgRussia Ural State Medical University YekaterinburgRussia

Infections by nonpolio enteroviruses(EVs)are highly prevalent,particularly among children and neonates,where they may cause substantial morbidity and mortality.Laboratory diagnosis of these viral infections is important in patient prognosis and guidance of clinical management.Although the laboratory diagnosis of non-polio EVs is mainly based on molecular techniques,classical virus-isolation techniques are still used in refer-ence laboratories.Other techniques,such as antigen detection and serology,are becoming obsolete and rarely used in diagnosis.An important part of diagnosis and surveillance of EV infections is viral typing by VP1 gene sequencing using conventional Sanger technique and more recently,full-genome next-generation sequencing.The latter allows the typing of all EVs,better investigation of EV outbreaks,detection of coinfec-tion,and identification of severity markers in the EV genome.

关键词： Nonpolio enteroviruses Virus isolation Nucleic acid amplification tests Sanger sequencing Next-generation sequencing

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Detection, isolation, and characterization of chikungunya viruses associated with the Pakistan outbreak of 2016–2017

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Virologica Sinica 2017年第6期32卷 511-519页

作者： Si-Qinq Liu Xiao Li Ya-Nan Zhang Ai-Li Gao Cheng-Lin Deng Jun-Hua Li Shoukat Jehan Nadia Jamil Fei Deng Hongping Wei Bo Zhang Chinese Academy of Sciences Key Laboratory of Special Pathogens and Biosafety Center for Emerging Infectious DiseasesWuhan Institute of VirologyChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100012China School of Life Science Northeast Agricultural UniversityHarbin 150036China Centre of Excellence in Science and Applied Technology Islamabad 44000Pakistan State Key Laboratory of Virology Wuhan Institute of VirologyChinese Academy of SciencesWuhan 430071China

The chikungunya virus(CHIKV) is a mosquito-transmitted alphavirus, which has infected millions of people in Africa, Asia, Americas, and Europe since it reemerged in India and Indian Ocean regions in 2005–2006. Starting in the middle of November 2016, CHIKV has been widely spread, and more than 4,000 cases of infections in humans were confirmed in Pakistan. Here, we report the first isolation and characterization of CHIKV from the Pakistan outbreak. Eight CHIKV strains were newly isolated from human serum samples using a cell culture procedure. A full-length genome sequence and eight complete envelope(E1) sequences of CHIKV from Pakistan were obtained in this study. Alignment of the CHIKV E1 sequences revealed that the eight new CHIKV isolates were highly homogeneous, with only two nonsynonymous substitutions found at generally conserved sites(E99 and Q235). Based on the comparison of 342 E1 sequences, the two nonsynonymous mutations were located in well-recognized domains associated with viral functions such as the cell fusion and vector specificity, suggesting their potential functional importance. Phylogenetic analysis indicated that the CHIKV strains from Pakistan originated from CHIKV circulating in the Indian region. This study helps elucidate the epidemics of CHIKV in Pakistan and also provides a foundation for studies of evolution and expansion of CHIKV in South Asia.

关键词： chikungunya virus(CHIKV) Pakistan Virus isolation clinical serum molecular characterization

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Inhibition of dengue virus replication by diisopropyl chrysin-7-yl phosphate

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Science China(Life Sciences) 2016年第8期59卷 832-838页

作者： Jiang Du Zhe Chen Ting Zhang Iianmin Wang Qi Jin MOH Key Laboratory of Systems Biology of Pathogens Institute of Pathogen BiologyChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100176China

Dengue fever is a tropical disease and caused by dengue virus(DENV), which is transmitted by mosquitoes and infects about 400 million people annually. With the development of international trade and travel, China is facing a growing threat. Over 40 thousands of people were infected during the 2014 DENV outbreak in Guangdong. Neither licensed vaccine nor therapeutic drug has been available. In this report, we isolated two clinical DENV strains. The full-length genome was sequenced and characterized. We also applied a flavonoid, CPI, into an anti-DENV assay. Replication of viral RNA and expression of viral protein was all strongly inhibited. These results indicated that CPI may serve as potential protective agents in the treatment of patients with chronic DENV infection.

关键词： dengue virus Virus isolation phylogenetic analysis antiviral activity flavonoid

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