A handover ceremony is held for the second batch of COVID-19 vaccines donated by the Chinese government at Noor Khan Air Base near Islamabad, capital of Pakistan, March 17, 2021. (Xinhua/Ahmad Kamal)

A handover ceremony is held for the second batch of COVID-19 vaccines donated by the Chinese government at Noor Khan Air Base near Islamabad, capital of Pakistan, March 17, 2021. (Xinhua/Ahmad Kamal)

A handover ceremony is held for the second batch of COVID-19 vaccines donated by the Chinese government at Noor Khan Air Base near Islamabad, capital of Pakistan, March 17, 2021. (Xinhua/Ahmad Kamal)

A handover ceremony is held for the second batch of COVID-19 vaccines donated by the Chinese government at Noor Khan Air Base near Islamabad, capital of Pakistan, March 17, 2021. (Xinhua/Ahmad Kamal)