People take nucleic acid test for COVID-19 in Bang Khae district in Bangkok, Thailand, on March 15, 2021. Thailand on Monday confirmed 78 new COVID-19 cases, mostly via active testing, and one more fatality, according to the Center for the COVID-19 Situation Administration (CCSA). (Xinhua/Rachen Sageamsak)

A resident takes nucleic acid test for COVID-19 in Bang Khae district in Bangkok, Thailand, on March 15, 2021. Thailand on Monday confirmed 78 new COVID-19 cases, mostly via active testing, and one more fatality, according to the Center for the COVID-19 Situation Administration (CCSA). (Xinhua/Rachen Sageamsak)

A boy takes nucleic acid test for COVID-19 in Bang Khae district in Bangkok, Thailand, on March 15, 2021. Thailand on Monday confirmed 78 new COVID-19 cases, mostly via active testing, and one more fatality, according to the Center for the COVID-19 Situation Administration (CCSA). (Xinhua/Rachen Sageamsak)