The U.S. government on Wednesday said it will start distributing a COVID-19 vaccine within one day of regulatory authorization as it plans for the possibility that a limited number of vaccine doses may be available at the end of the year… The federal government will allocate vaccines for each state based on the critical populations recommended first for vaccination by the U.S. Centers for Disease Control and Prevention. The guidelines suggest that the government is likely to broadly follow guidelines generated by an independent expert panel tapped by U.S. health officials to lay out which Americans to prioritize while vaccine supplies are limited… The document, called the COVID-19 Vaccination Program Interim Playbook, said limited COVID-19 vaccine doses may be available by early November 2020 if one is authorized by then, but that supply may increase substantially in 2021. Officials also said they were working to make sure there was no cost to patients for the vaccine.