A child receives a dose of the COVID-19 vaccine at a vaccination center in Cascais, Portugal, on Dec. 18, 2021.Photo:Xinhua
A child receives a dose of the COVID-19 vaccine at a vaccination center in Cascais, Portugal, on Dec. 18, 2021.Photo:Xinhua
A child receives a dose of the COVID-19 vaccine at a vaccination center in Cascais, Portugal, on Dec. 18, 2021.Photo:Xinhua
Children wait to receive the COVID-19 vaccine at a vaccination center in Cascais, Portugal, on Dec. 18, 2021.Photo:Xinhua
Children are seen with their parents after receiving the COVID-19 vaccine at a vaccination center in Cascais, Portugal, on Dec. 18, 2021.Photo:Xinhua