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A five-year-old boy receives his first dose of China's Sinovac COVID-19 vaccine at an inoculation site in Phnom Penh Nov. 1, 2021. Cambodia on Monday began to vaccinate five-year-old children with China's Sinovac COVID-19 vaccine as the vaccination for the population aged six and older was completed, Prime Minister Samdech Techo Hun Sen said. (Photo by Sovannara/Xinhua)