A couple by the Hoan Kiem Lake in Hanoi on January 31, 2020. Vietnam rolled out its contact-tracing app, Bluezone, designed to detect Covid-19 exposure in April this year. (Photo: Nhac Nguyen, AFP)
VIETNAM-CHINA-HEALTH-VIRUS
A couple by the Hoan Kiem Lake in Hanoi on January 31, 2020. Vietnam rolled out its contact-tracing app, Bluezone, designed to detect Covid-19 exposure in April this year. (Photo: Nhac Nguyen, AFP)