title: [Molecular characteristics of dengue virus outbreak in China-Myanmar border region, Yunnan province, 2015].
abstract: OBJECTIVE
  To understand the molecular characteristics of a dengue virus outbreak in China-Myanmar border region, Yunnan province, 2015 and provide etiological evidence for the disease control and prevention.
  
  
  METHODS
  Semi-nested RTPCR was conducted to detect the capsid premembrane (CprM) gene of RNA of dengue virus by using dengue virus NS1 positive serum samples collected in Mengdin township, Gengma county, Yunnan province in July, 2015. Some positive samples were then detected by using PCR with specific primers to amplify the full E gene. The positive PCR products were directly sequenced. Then sequences generated in this study were BLAST in NCBI website and aligned in Megalign in DNAstar program. Multiple sequence alignments were carried out by using Mega 5.05 software based on the sequences generated in this study and sequences downloaded from GenBank, including the representative strains from different countries and regions. Phylogenetic trees were constructed by using Neighbor-Joining tree methods with Mega 5.05 software.
  
  
  RESULTS
  Twenty one of 25 local cases and 10 of 14 imported cases from Myanmar were positive for DENV-1. Eight serum samples were negative for dengue virus. A total of 13 strains with E gene (1485 bp), including 8 local strains and 5 imported strains, were sequenced, which shared 100% nucleotide sequence identities. Twelve strains with CprM gene (406 bp) from 9 local cases and 3 imported cases shared 100% nucleotide sequence identities. Phylogenetic analyses based on E gene showed that the new 13 strains clustered in genotype I of dengue virus and formed a distinct lineage.
  
  
  CONCLUSIONS
  This outbreak was caused by genotype I of DENV-1, which had the closest phylogenetic relationships with dengue virus from neighboring Burma area. Comprehensive measures of prevention and control of dengue fever should be strengthened to prevent the spread of dengue virus.
authors.affiliation: Yunnan Provincial Key Laboratory of Vector-borne Diseases Control and Research and Yunnan Provincial Center of Arborvirus Research of Yunnan Institute of Parasitic Diseases, Pu'er 665000, China.
authors.forename: Xiaofang
authors.initials: X
authors.lastname: Guo
authors.affiliation: Yunnan Provincial Key Laboratory of Vector-borne Diseases Control and Research and Yunnan Provincial Center of Arborvirus Research of Yunnan Institute of Parasitic Diseases, Pu'er 665000, China.
authors.forename: Mingdong
authors.initials: M
authors.lastname: Yang
authors.affiliation: Yunnan Provincial Key Laboratory of Vector-borne Diseases Control and Research and Yunnan Provincial Center of Arborvirus Research of Yunnan Institute of Parasitic Diseases, Pu'er 665000, China.
authors.forename: Jinyong
authors.initials: J
authors.lastname: Jiang
authors.affiliation: Lincang County Center for Disease Control and Prevention, Lincang 677000, China.
authors.forename: Huachang
authors.initials: H
authors.lastname: Li
authors.affiliation: Gengma County Center for Disease Control and Prevention, Gengma 677500, China.
authors.forename: Chongge
authors.initials: C
authors.lastname: Zhu
authors.affiliation: Gengma County Center for Disease Control and Prevention, Gengma 677500, China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Gui
authors.affiliation: Gengma County Center for Disease Control and Prevention, Gengma 677500, China.
authors.forename: Liqun
authors.initials: L
authors.lastname: Bu
authors.affiliation: Yunnan Provincial Key Laboratory of Vector-borne Diseases Control and Research and Yunnan Provincial Center of Arborvirus Research of Yunnan Institute of Parasitic Diseases, Pu'er 665000, China.
authors.forename: Hongning
authors.initials: H
authors.lastname: Zhou
mesh_terms: D036022:Capsid Proteins; D002681:China / Q000453:epidemiology; D017931:DNA Primers; D030561:Databases, Nucleic Acid; D003715:Dengue / Q000453:epidemiology* / Q000821:virology*; D003716:Dengue Virus / Q000235:genetics*; D004196:Disease Outbreaks; D005838:Genotype; D006801:Humans; D002052:Myanmar / Q000453:epidemiology; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D016415:Sequence Alignment; D012984:Software
chemical_list: D036022:Capsid Proteins; D017931:DNA Primers