Expanded vaccine rollout in US spawns a new set of problems

FILE - In this Jan. 13, 2021, file photo, health care workers receive a COVID-19 vaccination at Ritchie Valens Recreation Center, Wednesday, Jan. 13, 2021, in Pacoima, 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/Marcio Jose Sanchez, File)

The rapid expansion of COVID-19 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.

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