Workers unload China's Sinopharm COVID-19 vaccines, donated by the Chinese government to Ethiopia, at the Addis Ababa Bole International Airport in Addis Ababa, Ethiopia, on March 30, 2021. (Photo by Michael Tewelde/Xinhua)

Workers unload China's Sinopharm COVID-19 vaccines, donated by the Chinese government to Ethiopia, at the Addis Ababa Bole International Airport in Addis Ababa, Ethiopia, on March 30, 2021. (Photo by Michael Tewelde/Xinhua)

Chinese Ambassador to Ethiopia Zhao Zhiyuan (2nd L) and Ethiopia Minister of Health Lia Tadesse (1st R) sign a contract for handover of COVID-19 vaccines from China at the Addis Ababa Bole International Airport in Addis Ababa, Ethiopia, on March 30, 2021. A batch of China's Sinopharm COVID-19 vaccines, donated by the Chinese government to Ethiopia, arrived here on Tuesday. (Photo by Michael Tewelde/Xinhua)

Workers unload China's Sinopharm COVID-19 vaccines, donated by the Chinese government to Ethiopia, at the Addis Ababa Bole International Airport in Addis Ababa, Ethiopia, on March 30, 2021. (Photo by Michael Tewelde/Xinhua)

A batch of China's Sinopharm COVID-19 vaccines, donated by the Chinese government to Ethiopia, arrive at the Addis Ababa Bole International Airport in Addis Ababa, Ethiopia, on March 30, 2021. (Photo by Michael Tewelde/Xinhua)