plague warning in Colorado” />GOLDEN, COLORADO – Jefferson County Public Health (JCPH) has confirmed a case of plague in a pet, prompting officials to issue a public health advisory on August 15, 2025.The case, detected in a cat residing near Golden, Colorado, marks the first confirmed instance of plague in the county this year and underscores the ongoing risk of exposure during warmer months.
The plague, a bacterial infection caused by Yersinia pestis, is typically spread to humans and animals through the bites of infected fleas. It can also be contracted through direct contact with infected animals, including rodents, rabbits, and cats. Symptoms in animals can include fever,lethargy,and swollen lymph nodes. Human symptoms include fever, chills, headache, and weakness.
“It’s not uncommon to see a few animal cases of plague in the warmer months in Colorado,” explained Jim Rada, Director of Jefferson County environmental Health, in a press release. “This year’s case highlights the importance of preventative measures, especially regarding flea control for pets.”
JCPH is advising residents to take the following precautions:
- Avoid contact with wild or dead animals,notably rodents and rabbits.
- Keep pets indoors whenever possible, or supervised when outdoors, to prevent them from hunting or coming into contact with fleas.
- Use flea control products on pets regularly, as recommended by a veterinarian.
- Report any sick or dead animals to JCPH at 303-271-5700.
colorado has historically been one of the states with the highest incidence of plague, with outbreaks occurring periodically since the early 20th century. According to the Colorado Department of Public Health and Environment (CDPHE), the state has recorded an average of 3-5 human cases of plague per year over the past decade. The last human case in Jefferson County was reported in 2022.
Early diagnosis and treatment with antibiotics are crucial for a full recovery from the plague. JCPH urges anyone experiencing symptoms consistent with the plague to seek immediate medical attention and inform their healthcare provider of potential exposure.
Veterinarians play a critical role in early detection, as they often see sick pets exhibiting plague symptoms. Local veterinary clinics, including the VCA Alameda East Animal Hospital and Banfield Pet Hospital in the Denver metro area, are equipped to diagnose and treat suspected cases.
