Quarantines, flu vaccines and other steps to take before the Wuhan virus becomes widespread.

By Luciana Borio and Scott Gottlieb

The novel coronavirus now epidemic in China has features that may make it very difficult to control. If public-health authorities don’t interrupt the spread soon, the virus could infect many thousands more around the globe, disrupt air travel, overwhelm health-care systems, and, worst of all, claim more lives. The good news: There’s still an opening to prevent a grim outcome.

China failed to contain the virus early. More cases in the U.S. are inevitable. Experience with the 2009 H1N1 flu pandemic suggests that emergency measures such as school closures and border screening—in place at 20 U.S. airports—can at most buy time. Several traits of the virus make border surveillance less effective. It results in a respiratory illness that looks like many other diseases. Some infected people won’t show symptoms while they’re traveling. Checkpoints don’t have tests that can diagnose the virus rapidly.