A woman receives a dose of COVID-19 vaccine in Lille, France, on Dec. 28, 2020. France started the vaccination campaign on Sunday. The French government has planned a gradual roll-out plan to invite citizens, on a voluntary basis and free of charge, to receive COVID-19 vaccine. (Photos: Xinhua)

A woman receives a dose of COVID-19 vaccine in Lille, France, on Dec. 28, 2020. France started the vaccination campaign on Sunday. The French government has planned a gradual roll-out plan to invite citizens, on a voluntary basis and free of charge, to receive COVID-19 vaccine.

A woman receives a dose of COVID-19 vaccine in Lille, France, on Dec. 28, 2020. France started the vaccination campaign on Sunday. The French government has planned a gradual roll-out plan to invite citizens, on a voluntary basis and free of charge, to receive COVID-19 vaccine.