Plague Bacteria Detected in Tahoe Basin Rodents, Officials Warn
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Recent surveillance has revealed the presence of plague bacteria in rodents within California’s tahoe Basin, prompting public health officials to remind residents and visitors about precautions to prevent infection.While human cases are rare, the bacteria – historically known for causing the bubonic plague – is naturally present in the region and can be transmitted to humans through flea bites or contact with infected animals.
What is Plague?
Plague is an infectious disease caused by the bacterium Yersinia pestis. According to the Centers for Disease Control and Prevention (CDC), symptoms typically appear within two to eight days of exposure and can include fever, chills, headache, and weakness. A characteristic symptom is swollen, painful lymph nodes (buboes), particularly in the groin, armpit, or neck. Plague can be effectively treated with antibiotics, especially if diagnosed early. There are three main forms of plague:
Bubonic Plague: The most common form,affecting the lymph nodes.
Septicemic Plague: Occurs when the bacteria enters the bloodstream.
Pneumonic Plague: The most severe form, affecting the lungs and spread through respiratory droplets.
Recent Findings in California
Public health officials in California routinely monitor rodent populations for evidence of plague. Between 2021 and 2024, 41 rodents tested positive for exposure to the plague bacteria. As of 2025, an additional four rodents in the tahoe Basin have tested positive, according to a release from El Dorado County.
Human cases remain infrequent. The last reported case in the South Lake Tahoe area was in 2020, and prior to that, two cases were identified in Yosemite National Park in 2015.
Precautions to Take
Kyle Fliflet, Acting Director of Public Health for El dorado County, emphasizes the importance of preventative measures. “Plague is naturally present in manny parts of California, including higher elevation areas of El Dorado County,” he stated. “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.”
To minimize the risk of contracting plague, officials recommend the following:
Avoid Contact: Do not touch squirrels, chipmunks, or other wild rodents, especially if they appear sick or dead.
Camping Safety: Avoid camping near areas where dead rodents have been observed.
Protective Clothing: Wear long pants tucked into boots when hiking or camping. Flea Control: Use insect repellent containing DEET or picaridin to reduce flea exposure on yourself and your pets.Talk to your veterinarian about flea control options for your animals. Pet Safety: Keep pets on a leash and prevent them from roaming freely in areas where rodents are present.
Report Sick Animals: Report any sick or dead rodents to local public health officials.
Key Takeaways
Plague is present in California,particularly in higher elevation areas like the Tahoe Basin.
Human cases are rare but can occur through flea bites or contact with infected animals.
Early diagnosis and antibiotic treatment are crucial for effective management.
* Taking preventative measures, such as avoiding contact with rodents and using insect repellent, can considerably reduce the risk of infection.
Looking Ahead: Public health officials will continue to monitor rodent populations and provide updates as needed. Staying informed and practicing preventative measures are the best ways to protect yourself and your pets from plague.