Emerging Infectious Diseases (May 2023)

Spatiotemporal Evolution of SARS-CoV-2 Alpha and Delta Variants during Large Nationwide Outbreak of COVID-19, Vietnam, 2021

  • Nguyen Thi Tam,
  • Nguyen To Anh,
  • Trinh Son Tung,
  • Pham Ngoc Thach,
  • Nguyen Thanh Dung,
  • Van Dinh Trang,
  • Le Manh Hung,
  • Trinh Cong Dien,
  • Nghiem My Ngoc,
  • Le Van Duyet,
  • Phan Manh Cuong,
  • Hoang Vu Mai Phuong,
  • Pham Quang Thai,
  • Nguyen Le Nhu Tung,
  • Dinh Nguyen Huy Man,
  • Nguyen Thanh Phong,
  • Vo Minh Quang,
  • Pham Thi Ngoc Thoa,
  • Nguyen Thanh Truong,
  • Tran Nguyen Phuong Thao,
  • Dao Phuong Linh,
  • Ngo Tan Tai,
  • Ho The Bao,
  • Vo Trong Vuong,
  • Huynh Thi Kim Nhung,
  • Phan Nu Dieu Hong,
  • Le Thi Phuoc Hanh,
  • Le Thanh Chung,
  • Nguyen Thi Thanh Nhan,
  • Ton That Thanh,
  • Do Thai Hung,
  • Huynh Kim Mai,
  • Trinh Hoang Long,
  • Nguyen Thu Trang,
  • Nguyen Thi Hong Thuong,
  • Nguyen Thi Thu Hong,
  • Le Nguyen Truc Nhu,
  • Nguyen Thi Han Ny,
  • Cao Thu Thuy,
  • Le Kim Thanh,
  • Lam Anh Nguyet,
  • Le Thi Quynh Mai,
  • Tang Chi Thuong,
  • Le Hong Nga,
  • Tran Tan Thanh,
  • Guy Thwaites,
  • H. Rogier van Doorn,
  • Nguyen Van Vinh Chau,
  • Thomas Kesteman,
  • Le Van Tan

DOI
https://doi.org/10.3201/eid2905.221787
Journal volume & issue
Vol. 29, no. 5
pp. 1002 – 1006

Abstract

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We analyzed 1,303 SARS-CoV-2 whole-genome sequences from Vietnam, and found the Alpha and Delta variants were responsible for a large nationwide outbreak of COVID-19 in 2021. The Delta variant was confined to the AY.57 lineage and caused >1.7 million infections and >32,000 deaths. Viral transmission was strongly affected by nonpharmaceutical interventions.

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