A Rare Ebola Strain Exposes Gaps in a Decade of Preparation

More than a decade after surviving Ebola, Craig Spencer still thinks about the isolation ward at Bellevue Hospital in Manhattan.

The emergency physician became New York City’s first — and only — Ebola patient in 2014 after returning from Guinea, where he treated people during the West Africa epidemic that killed more than 11,000 people and reached London, Dallas and several other major cities around the world. Officials closed a Brooklyn bowling alley he had visited and traced subway contacts across Manhattan as fear spread through the city, though no secondary infections were detected.

This week, another American doctor brought ...