TIME plague

3 New Plague Cases Confirmed in Colorado

The state health department has found a total of four people infected with the pneumonic plague

Three new cases of plague have been identified in Colorado for a total so far of four, the state health department announced Friday.

The four people diagnosed all had contact with a dog that died of the plague. The initial patient remains hospitalized but the three infected later “all had minor symptoms, were treated with appropriate antibiotics, recovered and are no longer contagious,” the health department said in a release.

Plague is spread from rodent—in this case prairie dogs—to other animals, including humans, by rogue fleas.

Of the 60 cases of plague in its various forms that Colorado has seen in recent years, nine people have died from the disease, according to a Bloomberg report. Doctors recommend keeping a safe distance from any rodents, alive or dead.

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