The third shipment of the COVID-19 vaccine from the Chinese pharmaceutical company Sinovac arrived Saturday at the Mexico City's international airport. (Photos: Xinhua)

Staff members unload a container of the COVID-19 vaccine from the Chinese pharmaceutical company Sinovac at the Mexico City's international airport in Mexico, March 13, 2021.

Staff members unload a container of the COVID-19 vaccine from the Chinese pharmaceutical company Sinovac at the Mexico City's international airport in Mexico, March 13, 2021.

Containers of the COVID-19 vaccine from the Chinese pharmaceutical company Sinovac are seen at the Mexico City's international airport in Mexico, March 13, 2021.

Staff members unload containers of the COVID-19 vaccine from the Chinese pharmaceutical company Sinovac at the Mexico City's international airport in Mexico, March 13, 2021.