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Ruth Ann Platt, who saw the news on television about effective vaccines against the coronavirus, couldn't wait for them to get to her nursing home in Gainesville, Ga. "I thought it was great from the start," she said.When Ms. Platt, 88,…

In early January, Nali Gillespie watched her social media feed fill with vaccine selfies: photo after photo of peers at other medical schools across the country proudly posing next to a syringe with their dose of either Moderna or Pfizer…