In this combo photo, the upper part taken on Jan. 6, 2021 shows Wang Yansen, a medical expert, receiving a dose of COVID-19 vaccine at Shandong No. 3 provincial hospital in Jinan, capital of east China's Shandong Province, and the lower part taken on May 8, 2021 shows Wang Yansen displaying his "gilt-edged" green health code. To encourage more people to receive COVID-19 vaccination, the health authority in Shandong has upgraded the health codes to the "gilt-edged" version as of May 3, 2021 for all those who have accomplished the vaccination procedure. (Xinhua/Guo Xulei)
