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"Prairie dog colonies are monitored and burrows are treated with insecticide, but there is still evidence of fleas in hiking and camping areas, which could put people and pets at risk, so these areas will remain closed, "said John M Douglas, Jr., executive director of the Tri-County Health Department.
No human infections have been reported, he said.
Despite its name and fatal history in the Middle Ages, plague is rare and can usually be treated, at least in the United States.
In general, small mammals and rodents carrying infected fleas are carriers of the disease, which can be transmitted to pets or humans through flea bites or contact with an infected mammal.
More than 80% of American cases were bubonic. Untreated bubonic plague can develop into more severe pneumonic plague, which causes rapidly developing pneumonia after the spread of the bacteria into the lungs.
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