Can the U.S. avoid a ‘twindemic’ of coronavirus and flu?

Public health experts have feared for months that the United States would see a “second wave” of coronavirus cases in the fall as temperatures drop across the country. Now that autumn has officially begun, warnings that the U.S. could be heading for a catastrophic health crisis have become more urgent.

“We are entering into a risk period,” Dr. Anthony Fauci, the nation’s leading infectious diseases expert, told CNN on Tuesday. The U.S. has seen two distinct surges in coronavirus cases so far: the initial outbreak that reached its peak...