A tourist shows her green pass before entering the Torre degli Asinelli in Bologna, Italy, on Aug. 6, 2021. The COVID Green Pass started to be mandatory to enter restaurants, cafes and other eateries in Italy from Aug. 6. It is also required to enter live shows and concerts, sports events, museums and any other cultural facility, swimming pools and fitness centers, amusement and theme parks, betting shops and bingos, and to take part in public competitions. (Photo by Gianni Schicchi/Xinhua)

A tourist shows her green pass before entering the Torre degli Asinelli in Bologna, Italy, on Aug. 6, 2021. The COVID Green Pass started to be mandatory to enter restaurants, cafes and other eateries in Italy from Aug. 6. It is also required to enter live shows and concerts, sports events, museums and any other cultural facility, swimming pools and fitness centers, amusement and theme parks, betting shops and bingos, and to take part in public competitions. (Photo by Gianni Schicchi/Xinhua)

A staff member checks the green pass at the entrance of the Torre degli Asinelli in Bologna, Italy, on Aug. 6, 2021. The COVID Green Pass started to be mandatory to enter restaurants, cafes and other eateries in Italy from Aug. 6. It is also required to enter live shows and concerts, sports events, museums and any other cultural facility, swimming pools and fitness centers, amusement and theme parks, betting shops and bingos, and to take part in public competitions. (Photo by Gianni Schicchi/Xinhua)

(210806) -- ROME, Aug. 6, 2021 (Xinhua) -- Tourists line up to enter Galleria Borghese in Rome, Italy, on Aug. 6, 2021. The COVID Green Pass started to be mandatory to enter restaurants, cafes and other eateries in Italy from Aug. 6. It is also required to enter live shows and concerts, sports events, museums and any other cultural facility, swimming pools and fitness centers, amusement and theme parks, betting shops and bingos, and to take part in public competitions. (Xinhua/Jin Mamengni)

A customer shows the green pass to a staff member before entering the indoor dining area of a restaurant in Bologna, Italy, on Aug. 6, 2021. The COVID Green Pass started to be mandatory to enter restaurants, cafes and other eateries in Italy from Aug. 6. It is also required to enter live shows and concerts, sports events, museums and any other cultural facility, swimming pools and fitness centers, amusement and theme parks, betting shops and bingos, and to take part in public competitions. (Photo by Gianni Schicchi/Xinhua)

(210806) -- MILAN, Aug. 6, 2021 (Xinhua) -- Tourists show green passes to a staff member before entering the Duomo di Milano in Milan, Italy, on Aug. 6, 2021. The COVID Green Pass started to be mandatory to enter restaurants, cafes and other eateries in Italy from Aug. 6. It is also required to enter live shows and concerts, sports events, museums and any other cultural facility, swimming pools and fitness centers, amusement and theme parks, betting shops and bingos, and to take part in public competitions. (Photo by Alberto Lingria/Xinhua)

A staff member checks a green pass at the entrance of the Torre degli Asinelli in Bologna, Italy, on Aug. 6, 2021. The COVID Green Pass started to be mandatory to enter restaurants, cafes and other eateries in Italy from Aug. 6. It is also required to enter live shows and concerts, sports events, museums and any other cultural facility, swimming pools and fitness centers, amusement and theme parks, betting shops and bingos, and to take part in public competitions. (Photo by Gianni Schicchi/Xinhua)