Deer Mice & Hantavirus in Spokane

Most rodent problems in Spokane are a nuisance and a home-damage issue. Deer mice add a health dimension, because they are the primary carrier of hantavirus in the western United States, and they are common on the rural and semi-rural properties around Spokane: the farms and acreage toward Deer Park, the wheat country around Cheney, the scablands near Airway Heights, and any home with sheds, cabins, barns, or outbuildings at the edge of open ground. If you are cleaning out a mouse-fouled shed or cabin, the way you do it matters.

How to identify a deer mouse

Deer mice look different from the house mouse you find in a kitchen. They are bicolor, brown or grayish on top with a clean white belly and white feet, have large eyes and ears, and a tail that is dark above and light below. House mice, by contrast, are a uniform gray-brown. Deer mice prefer the outdoors and outbuildings over the living space, so they turn up in sheds, garages, cabins, stored items, and equipment more than in the kitchen.

Why the cleanup method matters

Hantavirus spreads mainly when particles from dried droppings, urine, and nesting material get stirred into the air and breathed in. That means the single most dangerous thing you can do is dry-sweep or vacuum a contaminated space, because it aerosolizes exactly the particles you do not want to inhale. Enclosed, undisturbed spaces like a closed-up cabin or a rarely-opened shed are the higher-risk settings. The U.S. Centers for Disease Control has clear guidance on cleaning up after rodents and preventing hantavirus that is worth reading before you start.

The safe cleanup steps

• Ventilate first. Open doors and windows and leave the space for at least 30 minutes before you go in.
• Do not sweep or vacuum. Both throw particles into the air. This is the rule that matters most.
• Protect yourself. Wear rubber or plastic gloves, and in heavily contaminated spaces, an N95 respirator.
• Wet everything down. Spray droppings, urine, and nests with a disinfectant or a bleach solution and let it soak for several minutes.
• Wipe, do not brush. Pick up the material with paper towels, wipe the area with disinfectant, and double-bag the waste.
• Clean up yourself. Wash gloved hands before removing gloves, then wash your hands thoroughly.

When to bring in help

A light bit of cleanup in a well-ventilated space can be handled carefully at home. For a heavily contaminated shed, cabin, attic, or crawl space, or if you are not confident doing it safely, it is worth having it handled professionally. Rodent cleanup removes droppings and nests with the right precautions, sanitizes the space, and replaces fouled insulation. And of course, the way to stop deer mice getting in at all is to remove them and seal the building. Call 509-401-4897 to talk it through.

Deer mouse and hantavirus questions

This guide is general information, not medical advice. If you have symptoms after a rodent exposure, contact a healthcare provider or the Spokane Regional Health District.