Photo taken on Dec. 22, 2020 shows Russia's Sputnik V vaccine at a plant in the Karaganda Region, Kazakhstan. Kazakhstan has started production of Russia's Sputnik V vaccine against the COVID-19.Photo:Xinhua

Photo taken on Dec. 22, 2020 shows the production line of Russia's Sputnik V vaccine at a plant in the Karaganda Region, Kazakhstan. Kazakhstan has started production of Russia's Sputnik V vaccine against the COVID-19.Photo:Xinhua

Photo taken on Dec. 22, 2020 shows the production line of Russia's Sputnik V vaccine at a plant in the Karaganda Region, Kazakhstan. Kazakhstan has started production of Russia's Sputnik V vaccine against the COVID-19.Photo:Xinhua

A frontline medical worker receives a COVID-19 vaccine at the vaccination center in Hawalli Governorate, Kuwait, Dec. 24, 2020. Kuwait launched on Thursday the national vaccination campaign against the COVID-19.Photo:Xinhua

Staff members of Kuwait's Ministry of Health walk inside the COVID-19 vaccination center in Hawalli Governorate, Kuwait, Dec. 24, 2020. Kuwait launched on Thursday the national vaccination campaign against the COVID-19.Photo:Xinhua

A medical worker prepares a COVID-19 vaccine at the vaccination center in Hawalli Governorate, Kuwait, Dec. 24, 2020. Kuwait launched on Thursday the national vaccination campaign against the COVID-19.Photo:Xinhua

An employee from Kuwait's Ministry of Health shows a COVID-19 vaccine at the vaccination center in Hawalli Governorate, Kuwait, Dec. 24, 2020. Kuwait launched on Thursday the national vaccination campaign against the COVID-19.Photo:Xinhua

An elder receives a COVID-19 vaccine at the vaccination center in Hawalli Governorate, Kuwait, Dec. 24, 2020. Kuwait launched on Thursday the national vaccination campaign against the COVID-19.Photo:Xinhua