California Resident Diagnosed with Plague After Lake Tahoe Camping Trip

South Lake Tahoe, Calif. (August 21, 2025) – Health officials in El Dorado County confirmed today that a local resident has tested positive for plague after camping in the South Lake Tahoe area. This marks California’s first human plague case since 2020.

A person, thought to have been bitten by an infected flea while camping near the Nevada border, is recovering at home. County health officials reported they are under medical supervision. ““Plague is found in many parts of California, especially in higher elevations like El Dorado County,” said Kyle Fliflet, acting public health director for El Dorado County. ““Individuals need to be cautious for themselves and their pets outdoors. This is key when walking, hiking, or camping near wild rodents.”

Plague comes from the bacterium Yersinia pestis. State and federal health agencies say it mostly spreads to humans through bites from infected fleas. These fleas often feed on wild rodents like squirrels and chipmunks. Symptoms usually show up within two weeks after exposure. They can include: - Fever - Headache - Nausea - Weakness - Swollen lymph nodes Modern antibiotic treatments are very effective if administered early.

The California Department of Public Health said that four rodents in the Tahoe Basin tested positive for plague this year. This follows a program that found signs of exposure in 41 local rodents from 2021 to 2024. Plague cases are rare in the United States. On average, only seven human infections are reported each year. Most of these occur in the rural West.

Health officials ask residents and visitors to stay away from wild rodents. They also recommend these precautions:

  • Wear long pants tucked into boots and apply insect repellent when hiking or camping.
  • Do not handle dead or injured rodents; camp away from areas where they are observed.
  • Keep pets on flea-control products and don’t let them roam in infected areas.

The community should clear brush, rock piles, and other spots where rodents might live around homes. This will help lower the risk of exposure. If you have symptoms like the plague after being outdoors, see a doctor right away.