Complex dynamic of dengue virus serotypes 2 and 3 in Cambodia following series of climate disasters

Veasna Duong (1) , Matthew R. Henn (2) , Cameron Simmons (3) , Chantha Ngan (4) , Bunthin Y (1) , Laurent Gavotte (5) , Alain Viari (6) , Sivuth Ong (1) , Rekol Huy (4) , Niall J. Lennon (2) , Sowath Ly (1) , Sirenda Vong (1) , Bruce W. Birren (6) , Jeremy J. Farrar (3) , Vincent Deubel (1) , Roger Frutos (7) , Philippe Buchy (1)

1 Institut Pasteur du Cambodge
2 BROAD INSTITUTE - Broad Institute of MIT and Harvard
3 OUCRU - Oxford University Clinical Research Unit [Ho Chi Minh City]
4 CNM - National Center of Parasitology
5 UM2 - Université Montpellier 2 - Sciences et Techniques
6 BAMBOO - An algorithmic view on genomes, cells, and environments
7 UMR INTERTRYP - Interactions hôtes-vecteurs-parasites-environnement dans les maladies tropicales négligées dues aux trypanosomatides

The Dengue National Control Program was established in Cambodia in 2000 and has reported between 10,000 and 40,000 dengue cases per year with a case fatality rate ranging from 0.7 to 1.7. In this study 39 DENV-2 and 57 DENV-3 viruses isolated from patients between 2000 and were fully sequenced. Five DENV2 and four DENV3 distinct lineages with different dynamics were identified. Each lineage was characterized by the presence of specific mutations with no evidence of recombination. In both DENV-2 and DENV-3 the lineages present prior to 2003 were replaced after that date by unrelated lineages. After 2003, DENV-2 lineages D2-3 and D2-4 cocirculated until 2007 when they were almost completely replaced by a lineage D2-5 which emerged from Conversely, all DENV-3 lineages remained, diversified and cocirculated with novel lineages emerging. Years 2006 and 2007 were marked by a high prevalence of DENV-3 and 2007 with a large dengue outbreak and a high proportion of patients with severe disease. Selective sweeps in DENV-1 and DENV-2 were linked to immunological escape to a predominately DENV-3-driven immunological response. The complex dynamic of dengue in Cambodia in the last ten years has been associated with a combination of stochastic climatic events, cocirculation, coevolution, adaptation to different vector populations, and with the human population immunological landscape.

Keywords: Dengue virus; DENV-2; DENV-3; Diversity; Lineage dynamics; Cambodia

Domains: Life Sciences [q-bio]; Microbiology and Parasitology; Virology

Veasna Duong, Matthew R. Henn, Cameron Simmons, Chantha Ngan, Bunthin Y, et al.. Complex dynamic of dengue virus serotypes 2 and 3 in Cambodia following series of climate disasters. Infection, Genetics and Evolution, 2012, pp.N/A. ⟨10.1016/j.meegid.2012.05.012⟩. ⟨pasteur-00793267⟩