[P-2] Poster Talk2

[P2-12] Pre-existing neutralizing activity to SARS-CoV-2 in Vietnam prior to COVID-19 pandemic, 2014-2019.

*NGAN THI THANH NGUYEN^1,2,3,4, Mei Ee Choo^1,2, Yukio Nakamura⁵, Suzuki Ryuji⁵, Shiina Takashi⁶, Shin-I Tadasu⁷, Fukuta Mizuki^1,2,3, Thach Co Nguyen⁴, Thuy Thi Thu Nguyen⁴, Hang Le Khanh Nguyen⁴, Thanh Thi Le⁴, Phuong Vu Mai Hoang⁴, Morita Kouichi^1,2,3, Duc Anh Dang⁴, Hasebe Futoshi^1,5, Mai Thi Quynh Le⁴, Moi Ling Meng^1,2,8 (1. Graduate School of Biomedical Sciences, Nagasaki University, Sakamoto 1-12-4, Nagasaki 852-8523, Japan., 2. Department of Virology, Institute of Tropical Medicine, Nagasaki University, Sakamoto 1-12-4, Nagasaki 852-8523, Japan, 3. Program for Nurturing Global Leaders in Tropical and Emerging Communicable Disease, Nagasaki University, Sakamoto 1-12-4, Nagasaki 852-8523, Japan., 4. National Institute of Hygiene and Epidemiology, 1 Yersin Street, Hanoi, 100000 Vietnam., 5. Vietnam Research Station, Center for Infectious Disease Researcher in Asia and Africa, Institute of Tropical Medicine, Nagasaki University, Sakamoto 1-12-4, Nagasaki 852-8523, Japan., 6. Repertoire Genesis Inc., Ibaraki, Japan, 7. Graduate School of Medicine, Tokai University, 8. School of International Health, Graduate School of Medicine, the University of Tokyo, Tokyo,113-0033 Japan)