Abstract

To determine the serotype and genotype of dengue virus (DENV) in Bhutan, we conducted phylogenetic analyses of complete envelope gene sequences. DENV-2 (Cosmopolitan genotype) predominated in 2004, and DENV-3 (genotype III) predominated in 2005–2006; these viruses were imported from India. Primary dengue infections outnumbered secondary infections, suggesting recent emergence.

Highlights

  • To determine the serotype and genotype of dengue virus (DENV) in Bhutan, we conducted phylogenetic analyses of complete envelope gene sequences

  • Serologic testing indicated that 28 samples from 2004 were positive for dengue by enzyme immunoassay (EIA); 15 were primary infections, and 13 were secondary infections according to published criteria [7]

  • Phylogenetic analysis of complete E gene sequences indicated that the 2 DENV-2 isolates sampled in 2004 fell into the Cosmopolitan genotype, which is widely distributed throughout the tropical and subtropical world (Figure 1)

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Summary

Introduction

To determine the serotype and genotype of dengue virus (DENV) in Bhutan, we conducted phylogenetic analyses of complete envelope gene sequences. Fiftytwo serum samples from this outbreak were tested by using dengue enzyme immunoassay (EIA) at the National Institute of Communicable Diseases, New Delhi, India. Since the initial report in 2004, fewer clinical cases were reported from Bhutan in 2005 and 2006; dengue virus 3 (DENV)-3 was the dominant serotype [5].

Results
Conclusion

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