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; OUCRU COVID-19 Research Group2

C Louise Thwaites, Tran Tan Thanh, Nguyen Thi Han Ny, Lam Anh Nguyet, Nguyen Thi Duy Nhat, Cao Thu Thuy, Nguyen Thi Le Thanh, Nguyen Thanh Dung; OUCRU Sero-surveillance Network; James Campbell, Pham Quang Thai, Le Van Tan, Marc Choisy, Maciej F Boni

Nguyen Van Vinh Chau, Lam Anh Nguyet, Nguyen Thanh Dung, Vo Minh Quang, Nguyen Thanh Truong, Le Mau Toan, Le Manh Hung, Dinh Nguyen Huy Man, Dao Bach Khoa, Nguyen Thanh Phong, Nghiem My Ngoc, Huynh Phuong Thao, Dinh Thi Bich Ty, Pham Ba Thanh, Nguyen Thi Han Ny, Le Kim Thanh, Cao Thu Thuy, Nguyen To Anh, Nguyen Thi Thu Hong, Le Nguyen Truc Nhu, Lam Minh Yen, Guy Thwaites, Tran Tan Thanh, Le Van Tan; for OUCRU COVID-19 Research Group

Nguyen Van Vinh Chau, Lam Anh Nguyet, Nguyen Thanh Truong, Le Mau Toan, Nguyen Thanh Dung, Le Manh Hung, Mai Thanh Nhan, Dinh Nguyen Huy Man, Nghiem My Ngoc, Huynh Phuong Thao, Tran Nguyen Hoang Tu, Huynh Kim Mai, Do Thai Hung, Nguyen Thi Han Ny, Le Kim Thanh, Nguyen To Anh, Nguyen Thi Thu Hong, Le Nguyen Truc Nhu, Lam Minh Yen, Marc Choisy, Tran Tan Thanh, Guy Thwaites, Le Van Tan, Oxford University Clinical Research Unit COVID-19 Research Group

Nguyen Van Vinh Chau, Nghiem My Ngoc, Lam Anh Nguyet, Vo Minh Quang, Nguyen Thi Han Ny, Dao Bach Khoa, Nguyen Thanh Phong, Le Mau Toan, Nguyen Thi Thu Hong, Nguyen Thi Kim Tuyen, Voong Vinh Phat, Le Nguyen Truc Nhu, Nguyen Huynh Thanh Truc, Bui Thi Ton That, Huynh Phuong Thao, Tran Nguyen Phuong Thao, Vo Trong Vuong, Tran Thi Thanh Tam, Ngo Tan Tai, Ho The Bao, Huynh Thi Kim Nhung, Nguyen Thi Ngoc Minh, Nguyen Thi My Tien, Nguy Cam Huy, Marc Choisy, Dinh Nguyen Huy Man, Dinh Thi Bich Ty, Nguyen To Anh, Le Thi Tam Uyen, Tran Nguyen Hoang Tu, Lam Minh Yen, Nguyen Thanh Dung, Le Manh Hung, Nguyen Thanh Truong, Tran Tan Thanh, Guy Thwaites, Le Van Tan, for the OUCRU COVID-19 research group