A girl receives a dose of CoronaVac vaccine developed by Chinese laboratory Sinovac at a vaccination site in Rio De Janeiro, Brazil, on July 16, 2022. (Xinhua/Wang Tiancong)

A woman and her child wait at a vaccination site in Rio De Janeiro, Brazil, on July 16, 2022. (Xinhua/Wang Tiancong)

Children leave after receiving doses of CoronaVac vaccine developed by Chinese laboratory Sinovac at a vaccination site in Rio De Janeiro, Brazil, on July 16, 2022. (Xinhua/Wang Tiancong)

A medical worker prepares a dose of CoronaVac vaccine developed by Chinese laboratory Sinovac at a vaccination site in Rio De Janeiro, Brazil, on July 16, 2022. (Xinhua/Wang Tiancong)

A medical worker administers a dose of CoronaVac vaccine developed by Chinese laboratory Sinovac to a boy at a vaccination site in Rio De Janeiro, Brazil, on July 16, 2022. (Xinhua/Wang Tiancong)

A medical worker administers a dose of CoronaVac vaccine developed by Chinese laboratory Sinovac to a girl at a vaccination site in Rio De Janeiro, Brazil, on July 16, 2022. (Xinhua/Wang Tiancong)