A month ago, new coronavirus cases in the United States were ticking steadily downward and the worst of a miserable summer surge fueled by the Delta variant appeared to be over. But as Americans travel this week to meet far-flung relatives for Thanksgiving dinner, new virus cases are rising once more, especially in the Upper Midwest and Northeast. Federal medical teams have been dispatched to Minnesota to help at overwhelmed hospitals. Michigan is enduring its worst-case surge yet, with daily caseloads doubling since the start of November. Even New England, where vaccination rates are high, is struggling, with Vermont, Maine and New Hampshire trying to contain major outbreaks. Nationally, case levels remain well below those seen in early September, when summer infections peaked, and are below those seen last Thanksgiving. But conditions are worsening rapidly, and this will not be the post-pandemic Thanksgiving that Americans […]