Expanded vaccine rollout in US spawns a new set of problems

Naomi Adams checks on residents after they received the Pfizer COVID-19 vaccine Monday at Monarch Villa memory care facility in Stockbridge, Ga. (AP Photo/John Bazemore, 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.