A 10-year-old Colorado resident has died of plague in La Plata County, San Juan Basin Public Health says.
Colorado Department of Public Health and Environment and health officials said they were investigating the case and would provide more information as it became available, 9News reported.
No other information on the child was immediately released.
"We are so sad for the loss of this young Coloradan and our deepest condolences go to the family," said Dr Jennifer House, of the health department.
"Public Health is doing an epidemiological investigation and wants Coloradans to know that while this disease is very rare, it does occur sometimes, and to seek medical care if you have symptoms."