Hantavirus Awareness

On this past weeks GMRS community Net, Angie R., WSDI574, discussed the recent news about a hantavirus outbreak linked to a cruise ship has brought renewed attention to this serious disease. Thank you to all those who contributed to a great conversation.

While the strain involved in that outbreak on the cruise ship differs from the one found in the United States, it serves as an important reminder that hantavirus remains a concern closer to home, especially here in Colorado.

In fact, Colorado consistently ranks among the states with the highest number of hantavirus cases, second only to New Mexico. For those of us living in rural communities where deer mice are common, understanding the risks and knowing how to safely clean areas where rodents may have been present is essential.

What Is Hantavirus?

Hantavirus is a family of viruses carried by rodents. More than 20 hantavirus species have been identified worldwide, with different strains occurring in different regions.

The strain most commonly found in Colorado and throughout the Southwestern United States is called Sin Nombre virus, which translates from Spanish as “no name.” This virus is carried primarily by deer mice, a common rodent throughout Colorado.

Deer mice can often be identified by their distinctive coloring: they typically have a dark upper body and tail with lighter-colored undersides.

Why Is Hantavirus Dangerous?

Although hantavirus infections are rare, they can be extremely serious. Since 1993, the virus has caused illness and death in rural areas across Colorado. According to health officials, up to 40% of people who develop severe hantavirus disease may die from the infection.

The peak season for hantavirus is typically spring and early summer, when many people begin cleaning sheds, garages, barns, cabins, and other storage areas where mice may have nested during the winter months.

How Do People Become Infected?

Unlike the strain recently reported on the cruise ship, the Sin Nombre virus found in the United States is not spread from person to person.

Instead, people become infected when they come into contact with virus particles from infected rodent urine, droppings, saliva, or nesting materials. These particles can become airborne when disturbed.

Common activities that may create a risk include:

• Sweeping mouse droppings

• Vacuuming contaminated areas

• Cleaning enclosed spaces without ventilation

• Handling dead rodents

• Being bitten by an infected rodent

When droppings or nesting materials are disturbed, tiny particles can become aerosolized and float in the air. Breathing in these contaminated particles is the most common way people become infected.

How to Safely Clean Areas with Mouse Droppings

If you discover signs of rodents in your garage, shed, barn, cabin, or home, follow these safety precautions:

Before Cleaning

• Air out the area by opening doors and windows for at least 30 minutes.

• Wear proper protective equipment, including:

  • Rubber or plastic gloves

  • An N-95 respirator mask

If You Find a Rodent Nest

Do not attempt to remove a large rodent nest yourself. Consider contacting a professional pest control service that has the proper equipment and training to safely handle contaminated materials.

Cleaning Mouse Droppings Safely

1. Never vacuum or sweep rodent droppings.

2. Spray droppings and contaminated areas thoroughly with a disinfectant or bleach solution.

3. Allow the solution to soak for at least five minutes.

4. Use paper towels to wipe up the material.

5. Dispose of used paper towels in a covered trash container.

6. Mop or sponge hard surfaces with disinfectant.

7. Clean floors, countertops, cabinets, drawers, and other hard surfaces.

Homemade Bleach Solution

To make a disinfecting bleach solution:

Mix 1½ cups of household bleach with 1 gallon of water.

Prepare fresh solution as needed and use it in a well-ventilated area.

After Cleaning

• Wash gloved hands with soap and water before removing gloves.

• Remove gloves carefully.

• Wash your hands thoroughly again with soap and warm water.

• If soap and water are unavailable, use an alcohol-based hand sanitizer.

Preventing Rodents Around Your Property

The best defense against hantavirus is preventing rodents from entering buildings in the first place.

Consider:

• Sealing holes and gaps around foundations, doors, and utility penetrations.

• Storing food, pet food, and bird seed in rodent-proof containers.

• Removing clutter that can provide nesting locations.

• Keeping grass and weeds trimmed around buildings.

We have seen field mice and mouse droppings around our own property, making this a good reminder that rodent prevention is not just a seasonal concern but an ongoing part of rural living.

Can Plants Help Deter Mice?

Some homeowners use strongly scented herbs as part of their rodent-deterrent strategy. While plants alone will not eliminate a rodent problem, certain herbs may help discourage mice from lingering near entrances and outdoor living spaces.

Two commonly recommended options that are generally considered non-toxic to cats include:

• Rosemary

• Sage

Both have strong scents that mice tend to dislike, while also being useful culinary herbs for the garden.

If you have pets, always research any plant before adding it to your landscape, as many commonly recommended rodent-repelling plants can be toxic to cats and dogs.

Final Thoughts

Hantavirus remains rare, but its severity makes prevention worth taking seriously. As spring and summer cleaning projects begin, taking a few extra precautions can greatly reduce the risk of exposure.

Whether you’re cleaning out a shed, opening a seasonal cabin, or organizing a garage, remember to ventilate the area, wear protective gear, avoid sweeping or vacuuming droppings, and disinfect before cleaning.

A little preparation can go a long way toward keeping you and your family safe.