2022. Available online: https://baochinhphu.vn/ty-le-tre-tu-vong-do-COVID-19-thap-nhung-khong-chu-quan-10222021617594895.htm (accessed on 1 March 2022). Vietnam New Agency Plus. The Number of COVID-19 Cases among Children Aged 5 to under 12 Years Old Has Increased 2022b. Available ...