A worker unloads the Sinopharm COVID-19 vaccine at the Kigali International Airport in Kigali, Rwanda, on Aug. 19, 2021. Rwanda on Thursday received 200,000 doses of the Sinopharm COVID-19 vaccine along with syringes donated by the Chinese government as the country is stepping up efforts to vaccinate as many people as possible against COVID-19. (Photo by Cyril Ndegeya/Xinhua)

A worker unloads the Sinopharm COVID-19 vaccine at the Kigali International Airport in Kigali, Rwanda, on Aug. 19, 2021. Rwanda on Thursday received 200,000 doses of the Sinopharm COVID-19 vaccine along with syringes donated by the Chinese government as the country is stepping up efforts to vaccinate as many people as possible against COVID-19. (Photo by Cyril Ndegeya/Xinhua)

Workers unload the Sinopharm COVID-19 vaccine at the Kigali International Airport in Kigali, Rwanda, on Aug. 19, 2021. Rwanda on Thursday received 200,000 doses of the Sinopharm COVID-19 vaccine along with syringes donated by the Chinese government as the country is stepping up efforts to vaccinate as many people as possible against COVID-19. (Photo by Cyril Ndegeya/Xinhua)

A batch of the Sinopharm COVID-19 vaccine arrives at the Kigali International Airport in Kigali, Rwanda, on Aug. 19, 2021. Rwanda on Thursday received 200,000 doses of the Sinopharm COVID-19 vaccine along with syringes donated by the Chinese government as the country is stepping up efforts to vaccinate as many people as possible against COVID-19. (Photo by Cyril Ndegeya/Xinhua)

A batch of the Sinopharm COVID-19 vaccine arrives at the Kigali International Airport in Kigali, Rwanda, on Aug. 19, 2021. Rwanda on Thursday received 200,000 doses of the Sinopharm COVID-19 vaccine along with syringes donated by the Chinese government as the country is stepping up efforts to vaccinate as many people as possible against COVID-19. (Photo by Cyril Ndegeya/Xinhua)