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epa09625385 Local police watch staff of the transport operator checking the QR code confirming that people received the Covid-19 vaccine, at Lanza Metro stop in Milan, Italy, 06 December 2021. The measures on the 'enhanced' green certificate (obtainable only with vaccination or recovery) come into effect from 06 December 2021 until 15 January 2022. EPA/Mourad Balti Touati