A boy in Idaho is recovering after being diagnosed with the plague, health officials have revealed.
It is the first human case in the state since the early 1990s, and is believed to be the only one reported this year.
Today, health officials in Elmore County, just east of the capital Boise, said the boy was diagnosed late last month.
Lab results this week confirmed he had the bubonic plague, which affects the lymph nodes (rather than the more deadly pneumonic plague which affects the lungs).
Officials are racing to determine whether he contracted the disease in Idaho or during a recent family trip to Oregon.
The child, who has not been identified, is now home after a course of antibiotics in a local hospital, Christine Myron, spokesperson for the Central District Health Department, said on Wednesday.
While it may sound like something out of the Middle Ages, the plague infects around seven Americans a year, and is generally treatable with antibiotics.
However, it is most common in southern Colorado, and northern Arizona and New Mexico - hundreds of miles from Idaho and half a country away from Oregon.
That said, researchers last year found traces of Yersinia pestis, the bacterium which causes the plague, among squirrels in Elmore County. This, though, has been the first human case contracted nearby.
The plague is generally transmitted to humans through the bites of infected fleas but can be transmitted by direct contact with infected animals including rodents and pets.
It is infamous for killing millions of people in Europe centuries ago.
Antibiotics are now effective in treating the disease, but officials say without prompt treatment, it can cause serious illness or death.
To lower your risk of contracting the disease, the CDC urges people to respond quickly to any rat or mouse infestations in your home, wear gloves when dealing with animals that could carry it, and keep fleas off your pets.
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