Paul Romer, a Nobel Prize-winning economist, envisions a day when all Americans are tested regularly for COVID-19, and they present proof when dining out or visiting a dentist.

Michael Osterholm, director of the Center for Infectious Disease Research and Policy at the University of Minnesota, said that if a "big peak" of coronavirus floods hospitals this winter, "we have the potential here to go through days we have not seen since World War II. ... As a nation, we will not be ready."