Objective To recover broad-neutralizing monoclonal antibodies(Bn Abs)from avian influenza A(H5N1)virus infection cases and investigate their genetic and functional features.Methods We screened the Abs repertoires of e...Objective To recover broad-neutralizing monoclonal antibodies(Bn Abs)from avian influenza A(H5N1)virus infection cases and investigate their genetic and functional features.Methods We screened the Abs repertoires of expanded B cells circulating in the peripheral blood of H5N1 patients.The genetic basis,biological functions,and epitopes of the obtained Bn Abs were assessed and modeled.Results Two Bn Abs,2-12 D5,and 3-37 G7.1,were respectively obtained from two human H5N1 cases on days 12 and 21 after disease onset.Both Abs demonstrated cross-neutralizing and Ab-dependent cellular cytotoxicity(ADCC)activity.Albeit derived from distinct Ab lineages,i.e.,V^H1-69-D2-15-JH^4(2-12D5)and V^H1-2-D3-9-JH^5(3-32 G7.1),the Bn Abs were directed toward CR6261-like epitopes in the HA stem,and HA2 I45 in the hydrophobic pocket was the critical residue for their binding.Signature motifs for binding with the HA stem,namely,IFY in VH1-69-encoded Abs and LXYFXW in D3-9-encoded Abs,were also observed in 2-12D5 and 3-32 G7.1,respectively.Conclusions Cross-reactive B cells of different germline origins could be activated and re-circulated by avian influenza virus.The HA stem epitopes targeted by the Bn Abs,and the two Ab-encoding genes usage implied the VH1-69 and D3-9 are the ideal candidates triggered by influenza virus for vaccine development.展开更多
Background Novel influenza A viruses of avian-origin may be the precursors of pandemic strains. This descriptive study aims to introduce a novel avian-origin influenza A （H10N8） virus which can infect humans and cau...Background Novel influenza A viruses of avian-origin may be the precursors of pandemic strains. This descriptive study aims to introduce a novel avian-origin influenza A （H10N8） virus which can infect humans and cause severe diseases. Methods Collecting clinical data of three cases of human infection with a novel reassortment avian influenza A （H10N8） virus in Nanchang, Jiangxi Province, China. Results Three cases of human infection with a new reassortment avian influenza A（H10N8） virus were described, of which two were fatal cases, and one was severe case. These cases presented with severe pneumonia that progressed to acute respiratory distress syndrome （ARDS） and intractable respiratory failure. Conclusion This novel reassortment avian influenza A （H10N8） virus in China resulted in fatal human infections, and should be added to concerns in clinical practice.展开更多
目的对2014年岳阳市2例人感染H7N9禽流感确诊病例的流行病学特征、外环境病原学监测结果进行分析,为人感染H7N9禽流感的防控提供依据。方法采用流行病学个案调查与描述性流行病学相结合方法,收集与分析2例确诊病例的流行病学相关资料;...目的对2014年岳阳市2例人感染H7N9禽流感确诊病例的流行病学特征、外环境病原学监测结果进行分析,为人感染H7N9禽流感的防控提供依据。方法采用流行病学个案调查与描述性流行病学相结合方法,收集与分析2例确诊病例的流行病学相关资料;采集病人咽拭子2份、密切接触者咽拭子6份、针对病人周边外环境样本118份、扩大监测外环境样本283份。采用Real time RT-PCR检测样本中的H7N9禽流感病毒核酸。结果 2例患者均为城镇女性,年龄60岁左右,有基础病史,病人发病前均有禽类接触史或污染的外环境暴露史,发病后经多家医院转诊治疗无效均死亡。病人咽拭子均为阳性、密切接触者咽拭子均为阴性,针对病人周边外环境样本阳性率为12.7%,扩大监测外环境样本阳性率为4.95%。结论外环境中的禽流感病毒可能是病例的传染来源。应定期开展岳阳市禽类市场及相关场所外环境H7N9禽流感病毒污染状况监测。展开更多
China has markedly increased infectious disease surveillance efforts after the outbreak of severe acute respiratory syndrome （SARS） in 2003.＇ When the first pneumonia cases with unknown etiology from Shanghai were ...China has markedly increased infectious disease surveillance efforts after the outbreak of severe acute respiratory syndrome （SARS） in 2003.＇ When the first pneumonia cases with unknown etiology from Shanghai were reported to the National Health and Family Planning Commission and the China Center of Disease Control and Prevention （CDC） in March 2013, our Chinese doctors and scientists show more confident to face the emerging infectious disease than 10 years ago.展开更多
基金supported by the General Program of the National Natural Science Foundation of China[No.31570162]the National Key Research Program[No.2016YFC1200200].
文摘Objective To recover broad-neutralizing monoclonal antibodies(Bn Abs)from avian influenza A(H5N1)virus infection cases and investigate their genetic and functional features.Methods We screened the Abs repertoires of expanded B cells circulating in the peripheral blood of H5N1 patients.The genetic basis,biological functions,and epitopes of the obtained Bn Abs were assessed and modeled.Results Two Bn Abs,2-12 D5,and 3-37 G7.1,were respectively obtained from two human H5N1 cases on days 12 and 21 after disease onset.Both Abs demonstrated cross-neutralizing and Ab-dependent cellular cytotoxicity(ADCC)activity.Albeit derived from distinct Ab lineages,i.e.,V^H1-69-D2-15-JH^4(2-12D5)and V^H1-2-D3-9-JH^5(3-32 G7.1),the Bn Abs were directed toward CR6261-like epitopes in the HA stem,and HA2 I45 in the hydrophobic pocket was the critical residue for their binding.Signature motifs for binding with the HA stem,namely,IFY in VH1-69-encoded Abs and LXYFXW in D3-9-encoded Abs,were also observed in 2-12D5 and 3-32 G7.1,respectively.Conclusions Cross-reactive B cells of different germline origins could be activated and re-circulated by avian influenza virus.The HA stem epitopes targeted by the Bn Abs,and the two Ab-encoding genes usage implied the VH1-69 and D3-9 are the ideal candidates triggered by influenza virus for vaccine development.
文摘Background Novel influenza A viruses of avian-origin may be the precursors of pandemic strains. This descriptive study aims to introduce a novel avian-origin influenza A （H10N8） virus which can infect humans and cause severe diseases. Methods Collecting clinical data of three cases of human infection with a novel reassortment avian influenza A （H10N8） virus in Nanchang, Jiangxi Province, China. Results Three cases of human infection with a new reassortment avian influenza A（H10N8） virus were described, of which two were fatal cases, and one was severe case. These cases presented with severe pneumonia that progressed to acute respiratory distress syndrome （ARDS） and intractable respiratory failure. Conclusion This novel reassortment avian influenza A （H10N8） virus in China resulted in fatal human infections, and should be added to concerns in clinical practice.
文摘目的对2014年岳阳市2例人感染H7N9禽流感确诊病例的流行病学特征、外环境病原学监测结果进行分析,为人感染H7N9禽流感的防控提供依据。方法采用流行病学个案调查与描述性流行病学相结合方法,收集与分析2例确诊病例的流行病学相关资料;采集病人咽拭子2份、密切接触者咽拭子6份、针对病人周边外环境样本118份、扩大监测外环境样本283份。采用Real time RT-PCR检测样本中的H7N9禽流感病毒核酸。结果 2例患者均为城镇女性,年龄60岁左右,有基础病史,病人发病前均有禽类接触史或污染的外环境暴露史,发病后经多家医院转诊治疗无效均死亡。病人咽拭子均为阳性、密切接触者咽拭子均为阴性,针对病人周边外环境样本阳性率为12.7%,扩大监测外环境样本阳性率为4.95%。结论外环境中的禽流感病毒可能是病例的传染来源。应定期开展岳阳市禽类市场及相关场所外环境H7N9禽流感病毒污染状况监测。
基金This study was supported by the grants from the National Natural Science Foundation of China （No. 81070005/H0104, No. 81030032/ H 19 and No. 81271840） and the Program for New Century Excellent Talents in University （No. NCET-10-0006）.
文摘China has markedly increased infectious disease surveillance efforts after the outbreak of severe acute respiratory syndrome （SARS） in 2003.＇ When the first pneumonia cases with unknown etiology from Shanghai were reported to the National Health and Family Planning Commission and the China Center of Disease Control and Prevention （CDC） in March 2013, our Chinese doctors and scientists show more confident to face the emerging infectious disease than 10 years ago.
