“We wouldn’t go nearly as close as China in terms of making those kinds of impositions on civil liberties,” said Glen Mays, professor of health policy at the Colorado School of Public Health. “As you get further down that list, the calculus the governor or state health official will have to make is, do the risks we face justify the economic and personal-freedom costs of adopting measures like canceling large events, closing schools or banning movement,” Mr. Mays said.