The CDC estimates that most people in these high-priority groups could be fully vaccinated by early next year if the Food and Drug Administration authorizes a vaccine by mid-December, as is currently anticipated.But because supplies will be short in the first few weeks after that authorization, individual health care and long-term care facilities will likely need to determine their own priority schedules for vaccination once they've obtained the vaccine. Long-term care facilities include nursing homes, assisted living and other residential facilities.The CDC estimates that 48 million doses will be needed to vaccinate these groups, which account for about 24 million people. It's anticipated that as many as 40 million doses could be available by the end of December, with 5 million to 10 million available each week afterward.