California Resident Tests Positive for Plague

PLACERVILLE, Calif. – El Dorado County health officials have been notified by the California Department of Public Health (CDPH) that a South Lake Tahoe resident has tested positive for plague. The individual is currently under the care of a medical professional and is recovering at home, according to the CDPH.

It’s believed that the person may have been bitten by an infected flea while camping in South Lake Tahoe area. Health officials are investigating the situation.

“Plague is naturally present in many parts of California, including higher elevation areas of El Dorado County, said Kyle Fliflet, El Dorado County’s Acting Director of Public Health. “It’s important that individuals take precautions for themselves and their pets when outdoors, especially while walking, hiking and or camping in areas where wild rodents are present,” he added. 

Plague is caused by the bacterium, Yersinia pestis. Plague bacteria are most often transmitted by the bites of fleas that have acquired the bacteria from infected squirrels, chipmunks and other wild rodents. People can get plague when they are bitten by infected fleas. Plague can be prevented by avoiding contact with wild rodents, and by keeping pets away from rodent burrows.

Symptoms of plague usually show up within two weeks of exposure to an infected animal or flea and include fever, nausea, weakness and swollen lymph nodes. Plague can be effectively treated with antibiotics if detected early.

CDPH routinely monitors rodent populations for plague activity in California and closely coordinates with county health officials. Surveillance activities in El Dorado County from 2021 through 2024 found a total of 41 rodents (ground squirrels or chipmunks) with evidence of exposure to the plague bacterium. To date in 2025, four additional rodents have tested positive.  All these rodents were identified in the Tahoe Basin.