FILE - In this Jan. 7, 2021, file photo, registered nurse Merri Lynn Anderson puts on her protective equipment to check on her patient in a COVID-19 unit at St. Joseph Hospital in Orange, Calif. The rapid expansion of vaccinations to senior citizens across the U.S. has led to bottlenecks, system crashes and hard feelings in many states because of overwhelming demand for the shots. (AP Photo/Jae C. Hong, File)