President Joe Biden recently announced his “wartime” strategy to confront COVID-19. His weapon: vaccines. The battle plan builds on former President Donald Trump’s arsenal of 400 million vaccines, with a purchase of an additional 200 million more shots so all Americans can get both their recommended doses faster. To date, more than 60 million vaccine doses have been distributed in the United States and more than 10 million people have received their first of two doses. Priority favors health care workers and those most at risk from infection, but people at the back of the vaccine line worry their turn for a jab won’t come fast enough. Biden’s purchase aims to alleviate supply concerns by providing enough doses for all 300 million Americans by the end of summer 2021. But how many doses may go unclaimed? Health officials urge everyone to get vaccinated for COVID-19, but some are not so …