On February 3, the Central Epidemic Command Center (CECC) reported that a large-scale cluster infection of coronavirus disease 2019 (COVID-19) with unknown sources of infection occurred in Vietnam recently, and the Vietnamese authorities indicated there would be a risk of second wave of infection in the country. In consideration of the status of the COVID-19 pandemic in Vietnam, the CECC has moved Vietnam to its list of medium-risk countries/regions from low-risk countries/regions.