SEATTLE (AP) — Seattle’s new COVID-19 vaccination site aims to administer as many as 22,000 shots per day if supply allows, but it’s starting more modestly. King County Executive Dow Constantine, Seattle Mayor Jenny Durkan and Swedish Health Services CEO Guy Hudson welcomed the first patients as the site opened Saturday at the Lumen Field Event Center. Durkan said the site will initially vaccinate around 5,000 people per week, but could eventually handle 150,000 per week if enough vaccine is available. That would make it one of the country’s largest mass vaccination sites. The vaccines are available by appointment only.