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Li D.,Chinese National Institute for Viral Disease Control and Prevention
Emerging Microbes and Infections

Severe fever with thrombocytopenia syndrome (SFTS) is an emerging infectious disease that was discovered in China in 2010. The causative agent has been identified as a new member of the Phlebovirus genus in the family Bunyaviridae and has been designated severe fever with thrombocytopenia virus (SFTSV). SFTSV infection can be transmitted person-to-person, and the average case fatality rate is approximately 10% in humans. There is a high seroprevalence of SFTSV infection in a wide range of domesticated animals, including sheep, goats, cattle, pigs, dogs and chickens. Ticks are suspected to be the vector that transmits the virus to humans. Currently, the SFTS endemic area is expanding. Therefore, SFTSV infection is an increasingly important public health threat. © 2013 SSCC. All rights reserved. Source

Lu J.,Chinese National Institute for Viral Disease Control and Prevention
Bing du xue bao = Chinese journal of virology / [bian ji, Bing du xue bao bian ji wei yuan hui]

Severe fever with thrombocytopenia syndrome bunyavirus (SFTSV) is a novel phlebovirus, causing a life-threatening illness associated with the symptoms of severe fever and thrombocytopenia syndrome. The sequence and structure of the genome have already been illustrated in previous study. However, the characteristics and function of the structure and non-structure proteins is still unclear. In this study, we identified the density of the purified SFTSV virions as 1.135 g/mL in sucrose solution. Using RT-PCR method, we amplified the full coding sequence of RNA dependent RNA polymerase(RdRp), glycoprotein precursor (M), glycoprotein n (Gn), glycoprotein c (Gc), nuclear protein (NP) and non structural protein (NSs) of SFTSV (strain HB29). Respectively inserted the target genes into eukaryotic expression vector pcDNA5/FRT or VR1012, the target protein in 293T cell were successfully expressed. By analyzing the SFTSV virions in SDS-PAGE and using recombinant viral proteins with SFTS patients sera in Western blotting and Immunofluorescent assay, the molecule weight of structure and non-structure proteins of SFTSV were defined. The study provides the first step to understand the molecular characteristics of SFTSV. Source

Feng Y.,Chinese National Institute for Viral Disease Control and Prevention
Japanese journal of infectious diseases

A total of 54,673 mosquitoes were collected at 11 sites located near the China-Myanmar border in the western part of Yunnan Province during July and August 2007. There were 29 species in 4 genera identified from the collections, including 12 species of Culex, 12 species of Anopheles, 3 species of Aedes, and 2 species of Armigeres. Culex tritaeniorhynchus Giles (67.9%, 37,119/54,673) and Anopheles sinensis Wiedemann (25.9%, 14,170/54,673) were the most abundant species in this investigation. Virus was isolated using BHK-21 and C6/36 cells from 22 of 510 mosquito pools. Isolates included Japanese encephalitis virus (JEV) and Getah virus (GETV), which were identified by serological and molecular methods. Twenty JEV strains were isolated from Cx. tritaeniorhynchus (15 isolates), An. sinensis (3 isolates), and Armigeres subalbatus Coquillett (2 isolates), and 2 GETV strains were isolated from Culex pseudovishnui Colless and Cx. tritaeniorhynchus. This study suggests that Ar. subalbatus is a potentially important local vector because of the high JEV infection ratio found in this species. Enzootic JEV transmission persists in this area and therefore, surveillance for human disease caused by JEV and GETV should be conducted in the region. Source

Yang W.Z.,Chinese National Institute for Viral Disease Control and Prevention
Bing du xue bao = Chinese journal of virology / [bian ji, Bing du xue bao bian ji wei yuan hui]

To verify that the circular forms of bocavirus genome exist in their host, bocavirus episomes were detected in fecal samples of healthy piglets using a semi-nested PCR method. Two species of porcine bocaviruses (PBoVG2-episome and PBoVG3-episome) were identified for the first time. The relevant terminal sequences of the noncoding region (405 and 511 nt, respectively) were also obtained. Sequence analyses and secondary structure prediction indicated that the PBoVG2-episome was more similar to that of human bocavirus 3 (HBoV3) but the PBoVG3-episome was quite different from that of other members of the genus Bocavirus. Discovery of episomal forms of porcine bocaviruses (PBoV) suggested that PBoV, like HBoV, used a different replication mechanism from other parvoviruses. The sequencing of episome Inverted Terminal Repeats (ITRs) also contributes to a possible alternative strategy for constructing infectious molecular clones of bocavirus in a future study. Source

Li D.X.,Chinese National Institute for Viral Disease Control and Prevention
Clinical Microbiology and Infection

Severe fever with thrombocytopenia syndrome (SFTS) is a newly discovered emerging infectious disease that has recently become epidemic in Asia. The causative agent of SFTS is a novel phlebovirus in the family Bunyaviridae, designated SFTS virus (SFTSV). SFTS clinically presents with high fever, thrombocytopenia, leukocytopenia, gastrointestinal disorders, and multi-organ dysfunction, with a high viral load and a high case-fatality rate. In human infection, SFTSV targets microphages, replicates in the spleen of infected mice, and causes thrombocytopenia and a cytokine storm. The tick disseminates virus to humans and animals, forming a special transmission model in nature. Person-to-person transmission though direct contact with patient blood has been frequently reported. Measurements of viral RNA and antibodies have been established for diagnosis, but vaccines and specific therapeutics are not available so far. © 2015 European Society of Clinical Microbiology and Infectious Diseases. Source

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