检索结果-南通市图书馆

Genomic Surveillance for SARS-CoV-2 Variants: Dominance of XBB Replacement — China, January–June 2023

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China CDC weekly 2024年第15期6卷 324-331页

作者： Yenan Feng Qiudong Su Lili Li Xiaozhou He Peihua Niu Xiaojuan Guo Xiang Zhao Jing Tang Zhiyuan Jia Ji Wang Changcheng Wu Baicheng Xia Zhixiao Chen Yuchao Wu Jing Yang Songqi Chen Cao Chen Shiwen Wang Xiaoping Dong National Key Laboratory of Intelligent Tracking and forecasting for Infectious Diseases National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijingChina NHC Key Laboratory of Medical Virology and viral Diseases National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijingChina

Introduction:In the first half of 2023,a global shift was observed towards the predominance of XBB *** faced a significant epidemic between late 2022 and early 2023 due to Omicron subvariants BA.5.2 and *** study aims to depict the evolving variant distribution among provincial-level administrative divisions(PLADs)in China and explore the factors driving the predominance of XBB ***:Sequences from local and imported coronavirus disease 2019(COVID-19)cases recorded between January 1 and June 30,2023,were *** study analyzed the changing distribution of viral variants and assessed how the prior dominance of specific variants,XBB subvariants,and imported cases influenced the prevalence of the XBB replacement ***:A total of 56,486 sequences were obtained from local cases,and 8,669 sequences were from imported *** in April,there was a shift in the prevalence of XBB from imported to local cases,with varying dominance among *** PLADs previously high in BF.7,the rise of XBB was delayed.A positive correlation was found between XBB proportions in imported cases from January to March and local cases in *** distribution pattern of XBB subvariants differed between local and imported cases within the same *** significant differences were noted in the replacement rates of XBB ***:The timing of XBB dominance differed among various PLADs in China in the first half of 2023,correlating closely with the prevalence of XBB variants among imported cases.

关键词： dominance imported distribution

Two Peaks of Seasonal Influenza Epidemics -China, 2023

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China CDC weekly 2024年第36期6卷 905-910页

作者： Yiran Xie Shuxia Lin Xiaoxu Zeng Jing Tang Yanhui Cheng Weijuan Huang Jiandong Li Dayan Wang National Key Laboratory of Intelligent Tracking and forecasting for Infectious Disease National Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijingChina.

Introduction:Influenza is a communicable respiratory disease that causes annual epidemics and occasional unpredictable *** study examines the occurrence of two unexpected influenza peaks within the year ***:Influenza-like illness(ILI)data were reported,and specimens of ILI were collected by designated surveillance *** cases were confirmed using real-time reverse transcription polymerase chain reaction(rRT-PCR)testing conducted at national surveillance network *** data were then submitted to the Chinese Influenza Surveillance Information ***:From December 2022 to January 2023,influenza activity was minimal until a spring epidemic began in February,peaking in late *** outbreak spread from the north to the south,with A(H1N1)pdm09 being the predominant strain and A(H3N2)also circulating *** positivity rate in northern and southern provincial-level administrative divisions(PLADs)reached 60.0%(week 10)and 60.2%(week 13),respectively,before dropping to below 5%from May to ***,rates surged starting in week 41 in the south and week 44 in the north,peaking at 54.4%(week 50)and 44.0%(week 49),respectively,and remained high until the end of 2023.A(H3N2)became the prevailing strain,with a notable increase in B/Victoria lineage viruses from December,resulting in two peaks during the 2023 influenza ***:The pattern of the influenza epidemic shifted due to the coronavirus disease 2019(COVID-19)outbreak and is gradually returning to its usual seasonal and intensity *** is,therefore,crucial to continuously strengthen influenza surveillance,enhance the influenza surveillance network,and lay the groundwork for advancing integrated surveillance of multiple pathogens in China.

关键词： prevailing surveillance Influenza

Two-Dimensional Energy Balance Model and Its Application to Some Climatic Issues

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Meteorological Research 2014年第5期28卷 747-761页

作者：李耀锟巢纪平 College of global Change and Earth System Science Beijing Normal University National Marine Environmental forecasting Center

Based on a two-dimensional energy balance model, the studies on some climatic issues such as the re- lationship between ice cap latitude and solar constant, desertifieation, and the warming effect of carbon dioxide, have been reviewed and discussed. The phenomenon that a fixed solar constant might correspond to different equilibrium ice cap latitudes is determined by the continuity of albedo distribution. The disconti- nuity in albedo distribution increases the number of equilibrium ice cap latitudes. Desert would expand both northward and southward when desert surface albedo is increasing. This would deteriorate the ecological environment in border regions, and then threaten the existence of local inhabitants. Melting of the polar ice would not be accelerated, with increasing carbon dioxide concentration. The ice cap latitude would move northward slowly, with some “hiatus” periods, under the slowly increasing global average surface tempera- ture. According to the current research, future development of the two-dimensional energy balance model and possible progress are also forecasted.

关键词： two-dimensional energy balance model multiple equilibria ice cap latitude desertification warming effect of carbon dioxide

A226V variant of Chikungunya virus causing two outbreaks in 2010, Guangdong, China

在线全文

学校读者我要写书评

暂无评论

A226V variant of Chikungunya virus causing two outbreaks in ...

Potential effects of subduction rate in the key ocean on global warming hiatus

新发传染病研究热点研讨会

作者： Corina Monagin global viral forecasting San FranciscoCA 94104USA

Chikungunya virus(CHIKV) is a mosquito-borne emerging pathogen that has a major health impact in humans in tropical zones around the globe.A new variant of the virus,A226V,originating in East Africa,caused a large outbreak in the Indian Ocean islands and India during *** CHIKV outbreaks were reported in 2010 in China,and the virus was inferred to be the new A226V *** clarify the hypothesis,27 sera were collected from cases from the two outbreaks,and nucleic acid and antibody tests for CHIKV were performed using Real-time RT-PCR and indirect *** isolation was subjected to the positive samples for Real-time RT-PCR,and four viral genomes from two outbreaks were sequenced,characterized and phylogeneticly *** results show 13 samples positive for *** and five samples were tested with IgM and IgG against CHIKV *** of the five virus strains were successfully *** analysis revealed four viruses had a closest relationship(99.4～99.6% identify) with the Singapore 2008 isolate belonging to the Indian clad.A common mutation at the site of the A226V E1 protein was observed among four *** and three aa substitutions occurred in the Donggyan and Yangjiang outbreak strains *** can be concluded that the new A226V variant of CHIKV that originated in Southeast Asia caused two outbreaks in China in 2010.

关键词： chikungunya virus chikungunya fever phylogenetic analysis

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2018年第3期37卷 63-68页

作者： CHEN Xingrong LIU Shan CAI Yi ZHANG Shouwen National Marine Environmental forecasting Center State Oceanic Administration Key Laboratory of Research on Marine Hazards forecasting National Marine Environmental Forecasting CenterState Oceanic Administration

In this study, the possible effects of subduction rate on global warming hiatus were investigated using Simple Ocean Data Assimilation（SODA） data. This study first analyzed the characteristics of the temporal and spatial distribution of global subduction rate, which revealed that the North Atlantic meridional overturning circulation region and the Antarctic Circumpolar Current region are the two main sea areas with great subduction *** this basis, four key areas were selected to explore the relationship between the local subduction rate and the global mean sea surface temperature. In addition, the reason for the variations in subduction rate was preliminarily explored. The results show good correspondence of the subduction of the key areas in the North Atlantic meridional overturning the circulation region and the Antarctic Circumpolar Current region to the global warming hiatus, with the former leading by about 10 years. The subduction process may be a physical mechanism by which the North Atlantic overturning circulation and the Antarctic Circumpolar Current act on the stagnation of global warming. Advection effect plays an important role in the variations in subduction in the key regions. In the Antarctic Circumpolar Current region, the magnitude of sea surface wind stress is closely related to the local changes in subduction.

关键词： global warming hiatus sea surface temperature inter-decadal variation subduction rate

Epidemiological Characteristics of Dengue Fever-China,2005–2023

在线全文

学校读者我要写书评

暂无评论

China CDC weekly 2024年第41期6卷 1045-1048页

作者： Zhuowei Li Xiaoxia Huang Aqian Li Shanshan Du Guangxue He Jiandong Li National Key Laboratory of Intelligent Tracking and forecasting for Infectious Diseases NHC Key Laboratory of BiosafetyNHC Key Laboratory of Medical Virology and Viral DiseasesNational Institute for Viral Disease Control and PreventionChinese Center for Diseases Control and PreventionBeijingChina

Introduction:The global incidence of dengue fever has increased significantly over the past two decades,and China faces a significant upward trend in dengue control ***:Data were obtained from China’s NNDRS from 2005 to *** regression software was used to analyze temporal trends,while SaTScan software was used to analyze spatial,seasonal,and spatiotemporal *** software was used to visualize ***:A total of 117,892 dengue cases were reported from 2005 to 2023,with significant fluctuation in annual reported *** was not endemic in *** outbreaks most likely occurred in the southwestern,southeastern coastal,and inland areas of *** outbreaks have occurred between June and November,generally peaking in September or October,around epidemiological week(EW)***:Dengue challenges in China are *** case monitoring,proactive control interventions,and staff mobilization should be implemented before June to ensure a timely response to autochthonous outbreaks.

关键词： inland likely southwestern

Phylogenetic and molecular characterization of Coxsackievirus A24 variant isolates from a 2010 acute hemorrhagic conjunctivitis outbreak in Guangdong,China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phylogenetic and molecular characterization of Coxsackieviru...

A 31-year global Diurnal Sea Surface Temperature Dataset Created by an Ocean Mixed-Layer Model

新发和再发传染病防治热点研讨会

作者： Monagin Corina Hiromu Yoshida global viral forecasting Initiative National Institute of Infectious Diseases Gakuen

In the autumn of 2010,a large outbreak was reported in Guangdong Province through the acute viral conjunctivitis (AHC) surveillance system,resulting in more than 69,000 *** the 69,635 cases reported during the August-October period in 2010,73.5 % of index cases originated from students,children in kindergarten and workers in *** male to female ratio was 1.84:1 among 0-19 years.56 representative specimens collected from different regions in Guangdong Province were used for virus isolation and molecular-based ***24v was confirmed as the etiological pathogen of the ***,the phylogenetic analysis for the VP1 and 3C region on the viral genome was performed for 16 CA24v isolates,with results indicating that they belonged to the same genomic group ***,full nucleotide sequences for two representative isolates in 2010 were determined and compared with others,and frequent protein mutations were found in the multiple *** conclusion,a CA24v strain caused the 2010 AHC outbreak in Guangdong *** were the main population *** population density,an adaptive climate,and new mutations in the viral nucleic acids and proteins may have contributed to the outbreak.

关键词： CA24v AHC Molecular epidemiology Phylogenetic analysis Guangdong.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2018年第12期35卷 1443-1454页

作者： Xiang LI Tiejun LING Yunfei ZHANG Qian ZHOU Key Laboratory of Research on Marine Hazards forecasting National Marine Environmental Forecasting CenterState Oceanic Administration

A dataset of hourly sea surface temperature(SST) from the period 1 January 1982 to 31 December 2012, and covering the global ocean at a resolution of 0.3°× 0.3°, was created using a validated ocean mixed-layer model(MLSST). The model inputs were heat flux and surface wind speed obtained from the Coupled Forecast System Reanalysis dataset. Comparisons with in-situ data from the Tropical Atmosphere Ocean array and the National Data Buoy Center showed that the MLSST fitted very well with observations, with a mean bias of 0.07℃, and a root-mean-square error(RMSE) and correlation coefficient of 0.37℃ and 0.98, respectively. Also, the MLSST fields successfully reproduced the diurnal cycle of SST in the in-situ data, with a mean bias of -0.005℃ and RMSE of 0.26℃. The 31-year climatology revealed that the diurnal range was small across most regions, with higher values in the eastern and western equatorial Pacific, northern Indian Ocean, western Central America, northwestern Australia, and several coastal regions. Significant seasonal variation of diurnal SST existed in all basins. In the Atlantic and Pacific basins, this seasonal pattern was oriented north–south, following the variation in solar insolation, whereas in the Indian basin it was dominated by monsoonal variability. At the interannual scale, the results highlighted the relationship between diurnal and interannual variations of SST, and revealed that the diurnal warming in the central equatorial Pacific could be a potential climatic indicator for ENSO prediction.

关键词： SST diurnal cycle mixed-layer model climatic variation

Comparison of air-sea CO2 flux and biological productivity in the South China Sea,East China Sea,and Yellow Sea:a three-dimensional physical-biogeochemical modeling study

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2017年第12期36卷 1-10页

作者： JI Xuanliang LIU Guimei GAO Shan WANG Hui ZHANG Miaoyin National Marine Environmental forecasting Center Beijing 100081China Key Laboratory of Research on Marine Hazards forecasting National Marine Environmental Forecasting CenterState Oceanic AdministrationBeijing 100081China

Marginal seas play important roles in regulating the global carbon budget, but there are great uncertainties in estimating carbon sources and sinks in the continental margins. A Pacific basin-wide physical-biogeochemical model is used to estimate primary productivity and air-sea CO_2 flux in the South China Sea（SCS）, the East China Sea（ECS）, and the Yellow Sea（YS）. The model is forced with daily air-sea fluxes which are derived from the NCEP2 reanalysis from 1982 to 2005. During the period of time, the modeled monthly-mean air-sea CO_2 fluxes in these three marginal seas altered from an atmospheric carbon sink in winter to a source in summer. On annualmean basis, the SCS acts as a source of carbon to the atmosphere（16 Tg/a, calculated by carbon, released to the atmosphere）, and the ECS and the YS are sinks for atmospheric carbon（–6.73 Tg/a and –5.23 Tg/a, respectively,absorbed by the ocean）. The model results suggest that the sea surface temperature（SST） controls the spatial and temporal variations of the oceanic pCO_2 in the SCS and ECS, and biological removal of carbon plays a compensating role in modulating the variability of the oceanic pCO_2 and determining its strength in each sea,especially in the ECS and the SCS. However, the biological activity is the dominating factor for controlling the oceanic pCO_2 in the YS. The modeled depth-integrated primary production（IPP） over the euphotic zone shows seasonal variation features with annual-mean values of 293, 297, and 315 mg/（m^2·d） in the SCS, the ECS, and the YS, respectively. The model-integrated annual-mean new production（uptake of nitrate） values, as in carbon units, are 103, 109, and 139 mg/（m^2·d）, which yield the f-ratios of 0.35, 0.37, and 0.45 for the SCS, the ECS, and the YS, respectively. Compared to the productivity in the ECS and the YS, the seasonal variation of biological productivity in the SCS is rather weak. The atmospheric pCO_2 increases from 1982 to 2005, which is consistent with the anthropo

关键词： physical-biogeochemical model air to sea CO_2 flux South China Sea East China Sea Yellow Sea