Authorities believe an infected insect may have bitten him.
A resident of the California city of South Lake Tahoe fell ill with the Plague, which was confirmed by test results, local health authorities said.
El Dorado County said in a statement that the patient is “currently under the care of a medical professional and is recovering at home.”
Officials speculated that the patient, an “avid hiker,” might have been bitten by an “infected flea” while walking the dog in the Truckee river or Tahoe Keys area.
“Plague is naturally present in many areas of California, including the high-altitude areas of El Dorado County. It is important that people take precautions for themselves and their pets when they are outdoors, especially when hiking, and/or camping in areas where wild rodents are present,” said El Dorado County health system inspector Nancy Williams.