Health officials in California have confirmed that a resident of South Lake Tahoe has tested positive for plague, marking a rare but serious case of the illness in the state.
Authorities believe the individual contracted the disease from a flea bite while on a camping trip.
El Dorado County’s acting director of public health, Kyle Fliflet, released a statement addressing the case.
“Plague is naturally present in many parts of California, including higher elevation areas of El Dorado County,” Fliflet said.
“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.
The plague is caused by the bacterium Yersinia pestis and is typically carried by rodent species.
According to historical records, it was introduced to the United States in the early 20th century by immigrants traveling on rat-infested ships.
There are three primary forms of the disease:
- Bubonic plague, which affects the lymph nodes.
- Septicemic plague, which enters the bloodstream.
- Pneumonic plague, which impacts the lungs.
Symptoms of plague are often similar to those of the common cold and can take up to two weeks to appear after exposure.
The Centers for Disease Control and Prevention (CDC) reports that the United States sees an average of seven cases annually.
Most are recorded in the western states, including New Mexico, Arizona, Utah, and Colorado.
Transmission to humans generally occurs through flea bites, direct contact with an infected rodent, or improper handling of an animal carrying the disease.
Although plague is historically associated with catastrophic outbreaks such as the Black Death in the 14th century, modern medicine has significantly reduced its threat.
Infections today are commonly treatable with antibiotics, and the prognosis is generally favorable with timely medical intervention.
The last epidemic of plague in the United States occurred in Los Angeles between 1924 and 1925.
Since 2000, a total of 15 people nationwide have died from the illness, according to federal health data.
Earlier this summer, health officials in Arizona confirmed a plague-related death, the first fatality recorded in the United States in 2024.
That case was linked to a prairie dog die-off in the region.
California health officials are urging residents and visitors to remain cautious while outdoors, particularly in areas where rodents are active.
Recommended precautions include keeping pets on leashes, avoiding contact with wild animals, using insect repellent, and promptly reporting any unusual die-offs of rodents or other wildlife to local authorities.
The El Dorado County Department of Public Health has not released further details about the South Lake Tahoe patient, including their current condition.
Officials continue to monitor the area and are emphasizing preventive measures to reduce the risk of additional cases.
