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VirusDisease

, Volume 30, Issue 3, pp 380–386 | Cite as

Molecular and phylogenetic analysis of the dengue strains circulating in Odisha, India

  • J. Sabat
  • S. Subhadra
  • B. Thakur
  • M. Panda
  • S. Panda
  • S. S. Pati
  • L. M. Ho
  • S. Dixit
  • S. K. Rathore
  • S. K. Kar
  • B. DwibediEmail author
Original Article

Abstract

Dengue has emerged as a major public health challenge in terms of both changing clinical pattern and epidemiological features. The state of Odisha reported first dengue epidemic in the year 2010 and this continued each year in epidemic form during post monsoon period gradually becoming an endemic phenomenon. Present study depicts the changing epidemiological and clinical pattern of dengue with reference to its serotypes and genotypes. The study included 5320 suspected dengue cases from different health facilities of the state during 2010–2017. Dengue NS1 antigen and IgM antibody was done through ELISA. Serotyping was done through RTPCR by amplifying a part of core-pre-membrane gene (CprM) followed by sequencing and phylogenetic analysis. Dengue IgM antibody in 17.7% cases and NS1 antigen in 53.20% cases was detected. Dengue serotype 2 (DEN-2) was the only serotype detected in 2010 and 2011 where as all four serotypes 1, 2, 3, 4 were detected in 2012–2017, DEN-2 being dominant but in 2017 DEN-3 was found to be dominant. Phylogenetic analysis revealed genotype IV of DEN-2 and genotype III of DEN-1 and DEN-3 circulating in this region. In 6 cases involvement of DEN-2 in clinically evident encephalitis cases is an important observation in this region and needs public health attention. High prevalence of dengue was observed without any previous reported outbreaks in the state with increased number of cases from 2010 to 2012 affecting both urban and rural areas. High incidence in 2012 was due to co-circulation of more than one serotype which continued in the following years. Severity in some cases was associated with mixed infection but in most cases it was mild indicating the endemic nature of the virus in most parts of Odisha.

Keywords

Dengue Epidemiology Molecular Serotype Odisha 

Notes

Acknowledgements

Authors wish to thank IDSP, Govt. of Odisha for providing assistance during outbreak investigation. Authors also thank DHR, ICMR, New Delhi for financial support.

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Copyright information

© Indian Virological Society 2019

Authors and Affiliations

  1. 1.Department of PediatricsAIIMSBhubaneswarIndia
  2. 2.ICMR- Regional Medical Research CentreBhubaneswarIndia
  3. 3.Directorate of Medical researchIMS & SUM Hospital, S ‘O’ A UniversityBhubaneswarIndia

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