A health worker prepares a dose of China-donated COVID-19 vaccine in Dhaka, Bangladesh, May 25, 2021. Bangladesh began administering the China-donated COVID-19 vaccines to its medical students on Tuesday. (Xinhua)

A health worker prepares a dose of China-donated COVID-19 vaccine in Dhaka, Bangladesh, May 25, 2021. Bangladesh began administering the China-donated COVID-19 vaccines to its medical students on Tuesday. (Xinhua)

A student of Dhaka Medical College and Hospital receives a dose of China-donated COVID-19 vaccine in Dhaka, Bangladesh, May 25, 2021. Bangladesh began administering the China-donated COVID-19 vaccines to its medical students on Tuesday. (Xinhua)

A student of Dhaka Medical College and Hospital receives a dose of China-donated COVID-19 vaccine in Dhaka, Bangladesh, May 25, 2021. Bangladesh began administering the China-donated COVID-19 vaccines to its medical students on Tuesday. (Xinhua)

A health worker shows China-donated COVID-19 vaccines in Dhaka, Bangladesh, May 25, 2021. Bangladesh began administering the China-donated COVID-19 vaccines to its medical students on Tuesday. (Xinhua)

A student of Dhaka Medical College and Hospital receives a dose of China-donated COVID-19 vaccine in Dhaka, Bangladesh, May 25, 2021. Bangladesh began administering the China-donated COVID-19 vaccines to its medical students on Tuesday. (Xinhua)