Hantavirus in Colorado Springs, CO: Symptoms, Risk, and Safe Cleanup

Hantavirus is a serious, sometimes fatal respiratory illness spread by deer mice, and Colorado has one of the highest case counts of any state in the country. If you live in or near Colorado Springs — especially in a foothill-adjacent, rural, or newly developed neighborhood — understanding the real risk, the real symptoms, and the correct way to clean up rodent droppings is genuinely important information, not just a scare tactic used to sell pest control services.

What Hantavirus Is and How You Actually Get It

Hantavirus Pulmonary Syndrome (HPS) is caused by a virus carried primarily by deer mice (Peromyscus maniculatus) and, to a lesser extent, white-footed mice (Peromyscus leucopus). The virus is shed in an infected mouse's urine, droppings, and saliva. People become infected by breathing in contaminated dust — most commonly when sweeping, vacuuming, or otherwise disturbing an area where deer mice have been nesting, such as a shed, garage, cabin, crawlspace, or storage area that hasn't been used in a while. It is not spread person-to-person, and it is not carried by house mice, Norway rats, or roof rats in any significant way.

Colorado's Hantavirus Numbers: What the Data Actually Shows

Colorado has recorded 121 confirmed hantavirus cases through 2023, roughly 15% of all cases nationwide, and 45 deaths — the second-highest death toll of any state after New Mexico. The state continues to log cases every year — about four per year on average, according to the Colorado Department of Public Health and Environment. In May 2026, a Douglas County resident died from hantavirus, and a second case was confirmed days later in Arapahoe County, both linked to deer mouse exposure. Colorado State University's long-term deer-mouse research has shown that the timing and amount of rainfall is the key driver of rodent population spikes — wetter years produce sharper increases heading into fall, along with higher hantavirus prevalence. With a very strong El Niño underway through 2026, that rainfall-driven pattern is one more reason to take fall prevention seriously.

This data matters specifically for Colorado Springs because much of the metro area, particularly its foothill-adjacent and newly developed neighborhoods, sits directly against the kind of terrain where deer mice are established and active.

Symptoms and Timeline: What to Watch For

Early hantavirus symptoms are flu-like and easy to dismiss: fatigue, fever, muscle aches (especially in the thighs, hips, and back), headache, chills, and sometimes gastrointestinal symptoms like nausea or vomiting. These typically appear one to eight weeks after exposure. In a portion of cases, the illness progresses roughly four to ten days later into a more severe phase — coughing and shortness of breath as the lungs fill with fluid — which requires emergency medical care. There is no specific antiviral treatment and no vaccine; supportive care, particularly early oxygen therapy and intensive care if needed, is what improves outcomes, which is why early recognition matters so much.

Who Carries It — And Who Doesn't

Deer mice are the primary carrier in Colorado, with white-footed mice also capable of carrying the virus. House mice, Norway rats, roof rats, and pack rats are not considered significant hantavirus risks in Colorado, though their droppings still carry other contamination concerns like salmonella. This distinction is exactly why correctly identifying the rodent species in your home isn't a minor detail — it determines whether a cleanup needs hantavirus-level precautions or standard sanitation.

How to Safely Clean an Area With Rodent Droppings

• Never dry-sweep or vacuum droppings, nesting material, or dead rodents — this is the single most common mistake and the primary way people are exposed
• Ventilate the space for at least 30 minutes before entering, by opening doors and windows from outside the area if possible
• Wear rubber, latex, or vinyl gloves before starting any cleanup
• Thoroughly wet the droppings, urine, and nesting material with a household disinfectant or a diluted bleach solution before removing anything
• Once wet, wipe up the material with a paper towel and dispose of it in a sealed trash bag, then disinfect the entire area, including any surfaces the material may have touched

Who Is Most at Risk in Colorado Springs

Risk is not evenly spread across the metro. Homes in foothill-adjacent communities like Black Forest, Manitou Springs, Monument, Palmer Lake, Woodland Park, Cascade, and Green Mountain Falls sit closest to established deer mouse habitat and see this issue most often. New construction in growth areas like Falcon and Monument also carries elevated risk in the first year or two, since ground disturbance from building displaces existing rodent populations toward the nearest structure. Rural properties with barns, sheds, or cabins that sit unused for stretches of time are also higher risk, simply because deer mice have uninterrupted time to establish a nesting site.

When to See a Doctor

If you've had a known or possible exposure to deer mouse droppings, urine, or nesting material — especially in a shed, cabin, crawlspace, or garage that hasn't been used recently — and you develop flu-like symptoms within the following one to eight weeks, tell your doctor about the exposure specifically. Hantavirus is often missed early because its initial symptoms look like a common flu, and mentioning the possible exposure is what prompts appropriate testing and monitoring.