Fig. 2

COVID-19 incidence rate in Southern Vietnamese regions in 2021. During the first five months of 2021, the incidence rate remained at a consistently low level. In May 2021, the incidence rate increased to 0.8 per 100,000 population. Since June 2021, there has been an increase in the number of cases from 16.8 in June to 851.9 by December 2021