Plague Case Reported in South Lake Tahoe: Health Officials Urge Caution

A recent case of plague has emerged in the South Lake Tahoe area of California, raising concerns among public health officials and local residents. The El Dorado County Public Health Division confirmed that an individual tested positive for the disease, likely after being bitten by an infected flea while camping. The patient is currently recovering at home under medical supervision.

Understanding the Plague

Plague, caused by the bacterium Yersinia pestis, is a serious infectious disease that has historically caused significant mortality rates. While it is often associated with the Black Death of the 14th century, which decimated a large portion of Europe’s population, modern cases are rare and typically treatable with antibiotics if caught early.

According to Kyle Fliflet, the acting director of public health for El Dorado County, “Plague is naturally present in many parts of California, including higher elevation areas of El Dorado County.” This statement underscores the importance of awareness and preventive measures, especially in regions where wild rodents, known carriers of the disease, are prevalent.

Recent Case Details

The recent case marks the first reported human infection in El Dorado County since 2020. Prior to that, the last confirmed cases in California occurred in 2015, involving two individuals who were exposed while visiting Yosemite National Park. Fortunately, all previous patients have recovered after receiving appropriate medical treatment.

The California Department of Public Health (CDPH) has been actively monitoring rodent populations in the area. Between 2021 and 2024, surveillance efforts identified 41 rodents in El Dorado County that had been exposed to plague. In 2025, four additional rodents tested positive for the disease, all found within the Tahoe Basin.

Symptoms and Treatment

Symptoms of plague typically manifest within two weeks of exposure and can include fever, nausea, weakness, and swollen lymph nodes. Early detection is crucial, as the illness can be effectively treated with antibiotics. Health officials emphasize the importance of seeking medical attention if symptoms arise, particularly after visiting areas known for plague activity.

Preventive Measures

In light of this recent case, El Dorado County Public Health has issued several recommendations to minimize the risk of exposure to the plague:

• Avoid Contact with Rodents: Individuals should steer clear of squirrels, chipmunks, and other wild rodents.
• Pet Precautions: Pet owners are advised not to allow their animals to interact with sick or dead rodents. Additionally, using flea control products on pets and keeping them leashed outdoors can help prevent the spread of fleas.
• Protective Clothing: Wearing long pants and using insect repellent containing DEET while hiking or camping can provide an extra layer of protection.
• Awareness of Warning Signs: Visitors to the area should be vigilant and heed any posted warning signs regarding plague activity.
• Seek Medical Attention: Anyone experiencing symptoms after visiting a known plague area should consult a healthcare provider promptly.

Historical Context

The plague has a long and storied history, with its most infamous outbreak occurring in the 14th century, leading to the deaths of an estimated 25 million people in Europe alone. However, the disease has not been eradicated and continues to exist in various forms around the world, including in the United States.

In the U.S., plague cases are rare but do occur, primarily in rural areas of the West. The Centers for Disease Control and Prevention (CDC) reports that an average of seven human cases are documented each year, with the majority occurring in New Mexico, Arizona, and Colorado.

Conclusion

The recent plague case in South Lake Tahoe serves as a reminder of the importance of public health awareness and preventive measures, especially in areas where the disease is known to exist. While the risk of contracting plague remains low for most people, understanding the symptoms and taking appropriate precautions can help ensure safety for residents and visitors alike. As health officials continue to investigate the circumstances surrounding this case, the community is urged to remain vigilant and informed.