Emergence and continued circulation of dengue-2 (genotype IV) virus strains in northern India

Journal of Medical Virology
Paban Kumar DashAsha Mukul Jana

Abstract

Dengue (DEN) is an acute mosquito borne viral disease of mankind. Off late it has become an important public health concern in Southeast Asia. Although, all the four known dengue virus serotypes (DEN-1 to 4) are reported from time to time, in the recent past, DEN-2 has emerged as the predominant type, being the causative agent of several outbreaks of dengue fever (DF) and dengue haemorrhagic fever (DHF) in India. To elucidate the true molecular epidemiology of these viruses, we have sequenced C-prM gene junction (454 nucleotides) of 11 DEN-2 viruses directly from patient serum. The C-prM gene junction was amplified initially by reverse transcription-polymerase chain reaction followed by automated DNA sequencing. These sequences provide unique information with regard to molecular epidemiology when compared to other DEN-2 sequences from diverse geographic origins. The sequence analysis revealed that most of the mutations in this region remained silent, except a few at the carboxy-terminal of the capsid. Reported phylogenetic analysis classifies DEN-2 viruses into five distinct genotypes. The Gwalior DEN-2 viruses, included in the present study were classified into genotype-IV, and were found to be most closely related to Delhi 19...Continue Reading

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