One by one, from the world’s premier basketball league and international concerts to sprawling festivals, institutions have faced the same hard question: Is a public gathering worth the risk of spreading the new coronavirus?

The answer, again and again, has been “no.”

The Tokyo Olympics this week joined dozens of organizations, gatherings and cultural events that have changed their plans in the last few weeks, as the World Health Organization formally declared the coronavirus a pandemic, and the number of people who have been sickened or died has mounted.

The Trump administration has recommended closing schools and avoiding groups of more than 10 people as well as discretionary travel, bars, restaurants and food courts. State and local officials have imposed additional restrictions.

Some have held out amid the growing number of cancellations. The WWE said WrestleMania was still on, just with no audience. It will be streamed live on April 5.