People across the United States have likened signing up for a vaccine shot in recent weeks to refreshing a page for highly coveted concert tickets. In Michigan, a website for vaccine sign-ups crashed almost immediately after the state expanded vaccine access to people 65 and older. The site, which processes 900 appointments on a typical day, saw more than 25,000 people trying to register. In Texas one website saw 9,000 appointments fill in less than six minutes. Users in Minnesota reported similar issues. Some health departments in Florida are using the ticketing site Eventbrite, leading to concerns about ticket scalpers buying up slots and reselling them.