A staff member unloads the COVID-19 vaccines from China at Julius Nyerere International Airport in Dar es Salaam, Tanzania, on Nov. 1, 2021. Tanzania on Monday received the second batch of 500,000 Sinopharm vaccine doses from China, boosting the east African nation's drive to vaccinate its people against the COVID-19 pandemic. [Photo by Herman Emmanuel/Xinhua]

Tanzanian Minister for Health, Community Development, Gender, Elderly and Children Dorothy Gwajima (R) signs documents after receiving COVID-19 vaccines from China in Dar es Salaam, Tanzania, on Nov. 1, 2021. Tanzania on Monday received the second batch of 500,000 Sinopharm vaccine doses from China, boosting the east African nation's drive to vaccinate its people against the COVID-19 pandemic. [Photo by Herman Emmanuel/Xinhua]