Cleaning Up After Mice Without Breathing In Hantavirus
Hantavirus is the reason mouse cleanup in New Mexico gets its own guide. NMSU Extension notes that the illness was first identified in the Four Corners area in 1993 and that the strain found here, Sin Nombre virus, is tied to deer mice. People usually catch it by breathing in dust from droppings, urine or nests.
The New Mexico Department of Health counted seven cases statewide in 2025, three of them fatal. Cases are rare, and the cleanup steps below are simple. Follow them every time.
Before you start
The CDC says to open all the doors and windows for 30 minutes before cleaning, and to leave the space while it airs out. For a shed, cabin or car that's been closed up, the state health department gives the same advice: air it out before you go in.
Gather rubber or plastic gloves, paper towels, trash bags and a spray bottle. Mix the bleach solution fresh: the CDC calls for 1.5 cups of household bleach in a gallon of water.
The cleanup
Work in this order:
- Spray droppings, urine spots and nests until they're soaked
- Let the solution sit for 5 minutes
- Wipe it all up with paper towels
- Bag the towels and debris, then tie and toss the bag
- Mop hard floors or spray dirt floors with disinfectant
- Take off the gloves last and wash your hands
What not to do
Don't sweep. Don't vacuum. Both send dried droppings into the air. Don't pull a nest apart before it's been soaked. And don't use a regular dust mask in a tight space: NMSU Extension says confined areas call for a HEPA or N-100 respirator and that painters' masks don't do the job.
When to hire it out
Crawl spaces, attics, insulation full of droppings, or a shed packed with nests are jobs for a provider with the right gear. See droppings and nest cleanup and attic cleanup. If you feel ill after a cleanup, get to a doctor and tell them about the mice. The City of Albuquerque lists fatigue, fever and muscle aches as early signs, followed by coughing and shortness of breath.
Also asked
Do house mice carry hantavirus too?
Health agencies name the deer mouse as the main carrier, though other rodents can carry it. Treat any droppings with the same care.
Can I use a store-bought disinfectant instead of bleach?
The CDC says to let it soak 5 minutes or as long as the disinfectant label says. Read the label.