Evolution and spatiotemporal dynamics of enterovirus A71 subgenogroups in Vietnam

Nguyen Thi Thanh Thao, Celeste Donato, Vu Thi Huyen Trang, Nguyen Trung Kien, Pham Mai Thuy Trang, Tran Quoc Khanh, Dang Thi Nguyet, October M. Sessions, Hoang Quoc Cuong, Phan Trong Lan, Vu Thi Que Huong, H. Rogier Van Doorn, Dhanasekaran Vijaykrishna

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15 Citations (Scopus)


Background. Enterovirus A71 (EV-A71) is the major cause of severe hand, foot, and mouth disease and viral encephaliThis in children across the Asia-Pacifc 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. Te 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 specifc Asian countries representing genogroup-specifc sources of EV-A71 diversity. Conclusion. This study highlights a persistent transmission network of EV-A71, with specifc Asian countries seeding other countries in the region and beyond, emphasizing the need for improved EV-A71 surveillance and detailed genetic and antigenic characterization.

Original languageEnglish
Pages (from-to)1371-1379
Number of pages9
JournalThe Journal of Infectious Diseases
Issue number11
Publication statusPublished - 1 Dec 2017


  • Enterovirus A71
  • Hand foot and mouth disease
  • Phylogenetics
  • Vietnam

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