Two cases of plague at a New York City hospital turned out not to be bioterrorism, but they provided an opportunity to test how the city health system would handle an intentional attack.

The good news: Doctors say the system worked.

Hospital staff and health officials applied lessons from last year’s anthrax attacks to diagnose and treat the two patients quickly — and to prevent unnecessary public fear over the obscure disease.

The bubonic plague cases, diagnosed in a New Mexico couple who showed up at Beth Israel Medical Center on Nov. 5, were the first in New York City in at least a century.

“This was scary. Even the doctors had never seen a case,” said Dr. Beth Raucher, an epidemiologist at Beth Israel Medical Center, where the two patients were treated. “But everybody did what they had to do.” Reuters Health