1. Evolution and Spatiotemporal Dynamics of Enterovirus A71 Subgenogroups in Vietnam.
- Author
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Thao NTT, Donato C, Trang VTH, Kien NT, Trang PMMT, Khanh TQ, Nguyet DT, Sessions OM, Cuong HQ, Lan PT, Huong VTQ, van Doorn HR, and Vijaykrishna D
- Subjects
- Antigens, Viral, Asia epidemiology, Child, Child, Preschool, Disease Outbreaks, Enterovirus A, Human isolation & purification, Enterovirus A, Human pathogenicity, Enterovirus Infections transmission, Genetic Variation, Humans, Infant, Infant, Newborn, Phylogeny, Sequence Analysis, Vietnam epidemiology, Enterovirus A, Human classification, Enterovirus A, Human genetics, Enterovirus Infections epidemiology, Enterovirus Infections virology, Genotype, Spatio-Temporal Analysis
- Abstract
Background: Enterovirus A71 (EV-A71) is the major cause of severe hand, foot, and mouth disease and viral encephalitis in children across the Asia-Pacific region, including in Vietnam, which has experienced a high burden of disease in recent years. Multiple subgenogroups (C1, C4, C5, and B5) concurrently circulate in the region with a large variation in epidemic severity. The relative differences in their evolution and epidemiology were examined within Vietnam and globally., Methods: A total of 752 VP1 gene sequences were analyzed (413 generated in this study combined with 339 obtained from GenBank), collected from patients in 36 provinces in Vietnam during 2003-2013, along with epidemiological metadata. Globally representative VP1 gene datasets of subgenogroups were used to coestimate time-resolved phylogenies and relative genetic diversity to infer virus origins and regional transmission network., Results: Despite frequent virus migration between countries, the highest genetic diversity of individual subgenogroups was maintained independently for several years in specific Asian countries representing genogroup-specific sources of EV-A71 diversity., Conclusion: This study highlights a persistent transmission network of EV-A71, with specific Asian countries seeding other countries in the region and beyond, emphasizing the need for improved EV-A71 surveillance and detailed genetic and antigenic characterization., (© The Author 2017. Published by Oxford University Press for the Infectious Diseases Society of America. All rights reserved. For permissions, e-mail: journals.permissions@oup.com.)
- Published
- 2017
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