Colorado resident tests positive for pneumonic plague, family dogs dies from plague

This image depicts a magnified view of an oriental rat flea, Xenopsylla cheopis. Image/CDC

Tri-County Health Department officials and the Colorado Department of Public Health and Environment are working together to investigate the source of exposure and to identify those who may have been exposed through close contact with the individual. Any individuals exposed will be recommended for antibiotic treatment.

Pneumonic plague is probably the most serious form of plague and it’s when the bacteria infect the lungs and cause pneumonia. It is contracted when the bacteria is inhaled (primary) or develops when bubonic or septicemic plague spreads to the lungs.

Pneumonic plague is contagious and can be transmitted person to person. It is highly communicable under appropriate climate conditions, overcrowding and cool temperatures. Untreated pneumonic plague is frequently fatal. For more infectious disease news and information, visit and “like” the Infectious Disease News Facebook page

• Do not directly handle any dead rodents.
• Keep pets away from wildlife, especially dead rodents.
• Don’t let dogs or cats hunt prairie dogs or other rodents.
• Don’t allow pets to roam freely.
• Treat all pets for fleas according to a veterinarian’s advice.
• Do not feed prairie dogs or other rodents – this attracts them to your property, brings them in close contact with other rodents and increases the risk of disease transmission.
• Be aware of rodent populations in your area and report sudden die-offs or multiple dead animals to your local health department.