Cities and states are rapidly expanding access to vaccines as the nation races to head off a resurgence in coronavirus infections and reopen schools and businesses battered by the pandemic. The efforts come as the federal government ramps up shipments, with President Joe Biden saying the U.S. should have enough shots for all adults by the end of May. It also comes as more states are lifting restrictions like mask-wearing and reopening businesses despite warnings warnings from health officials that it’s too risky. Pennsylvania, Wisconsin and other states say teachers will get the first doses of the new one-shot Johnson & Johnson vaccine. Detroit is starting to vaccinate factory workers. And some states are vaccinating anyone 55 or older.