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Dengue virus (DENV) is the cause of one of the most prevalent neglected tropical diseases, and up to half of the world’s population is at risk for infection. Recent results from clinical trials have shown that DENV vaccination can induce the development of severe dengue disease and/or prolong hospitalization after natural infection in certain naive populations. Thus, it is crucial that vaccine development takes into account the history of DENV exposure in the targeted population. In Nepal, DENV infection was first documented in 2004, and despite the increasing prevalence of DENV infection, the population remains relatively naive. However, it is not known which of the four DENV serotypes circulate in Nepal or whether there is evidence of repeated exposure to DENV in the Nepali population. To address this, we studied 112 patients who presented with symptomology suspicious for DENV infection at clinics throughout Nepal during late 2015 and early 2016. Of the 112 patients examined, 39 showed serological and/or genetic evidence of primary or secondary DENV infection: 30 were positive for DENV exposure by IgM/IgG ELISA, two by real-time reverse-transcription PCR (RT-PCR), and seven by both methods. Dengue virus 1–3, but not DENV4, serotypes were detected by RT-PCR. Whole genome sequencing of two DENV2 strains isolated from patients with primary and secondary infections suggests that DENV was introduced into Nepal through India, with which it shares a porous border. Further study is needed to better define the DENV epidemic in Nepal, a country with limited scientific resources and infrastructure.

Whole Genome Sequencing of Dengue Virus Serotype 2 from Two Clinical Isolates and Serological Profile of Dengue in the 2015–2016 Nepal Outbreak