Workers transport a second batch of vaccines developed by Chinese pharmaceutical firm Sinopharm at an airport in the central Bolivian city of Cochabamba on March 30, 2021 to advance the country's mass immunization campaign against COVID-19. (Photos: Xinhua)

A plane carrying a second batch of vaccines developed by Chinese pharmaceutical firm Sinopharm arrives in the central Bolivian city of Cochabamba on March 30, 2021 to advance the country's mass immunization campaign against COVID-19.

Workers unload a second batch of vaccines developed by Chinese pharmaceutical firm Sinopharm from a plane at an airport in the central Bolivian city of Cochabamba on March 30, 2021 to advance the country's mass immunization campaign against COVID-19.