Syringes with doses of the Pfizer COVID-19 vaccine, are shown next to vaccination cards, Saturday, March 13, 2021, on the first day of operations at a mass vaccination site at the Lumen Field Events Center in Seattle, which adjoins the field where the NFL football Seattle Seahawks and the MLS soccer Seattle Sounders play their games. The site, which is the largest civilian-run vaccination site in the country, will operate only a few days a week until city and county officials can get more doses of the vaccine. (AP Photo/Ted S. Warren)