A medical worker prepares a dose of COVID-19 vaccine at the Universal Studios Hollywood in Los Angeles, California, the United States, มิถุนายน 18, 2021.(รูปถ่าย: Xinhua) China is not the only country fighting against the mutated variant of the SARS-CoV-2, which emerged late last year and began to rampage in recent days as more countries like the US and Singapore revised …