Written by The LadyBug Team· Indiana Licensed Pest Control Operators · 7A Structural & Nuisance Wildlife Control (ISCO & DNR) NPMA IPMA NWCOA
The LadyBug Pest & Wildlife Control · Voted Indy’s Best Pest Control 5 Years Running · Licensed & Insured ·
You wiped down your counters last night. Washed the dishes, put the food away, and went to bed. While you were sleeping, a mouse moved through your kitchen. Across the counter. Behind the appliances. Through the pantry. And when you woke up the next morning, there was no obvious sign it had ever been there.
That is the part most homeowners miss.
Mice are nocturnal, quiet, and capable of entering homes through entry points as small as a quarter of an inch, about the diameter of a pencil. They can move across food-preparation areas, get into stored food, and leave behind contamination long before you ever see the mouse itself. And that is where the conversation becomes bigger than simply having a mouse in the house. Mice can carry Salmonella, and as they move through a home, they can spread the bacteria into the same areas where your family stores food, prepares meals, and goes about everyday life.
So, how does something carried by a mouse end up becoming a concern for the people living inside the home?
It starts with understanding exactly what Salmonella is.
Salmonella is a type of bacteria that causes an illness called salmonellosis, but what makes it especially important in a conversation about mice is where that bacteria can travel.
Researchers have identified house mice as potential carriers of Salmonella and other bacteria that can cause gastrointestinal illness. In one study of wild house mice, Salmonella was found in 10% of the mice tested. Another study examined more than 400 house mice collected from residential buildings and found that they carried several gastrointestinal disease-causing bacteria, including Salmonella.
And a mouse does not have to look sick to create a concern inside a home. Rodents can carry disease-causing organisms without showing obvious signs of illness, which means there is no way to look at the mouse running across your kitchen floor and know what it may be carrying.
For people, Salmonella can cause diarrhea, fever, stomach cramps, nausea, and other gastrointestinal symptoms. According to the CDC, Salmonella causes an estimated 1.35 million infections, 26,500 hospitalizations, and 420 deaths in the United States every year.
But knowing a mouse can carry Salmonella is only half of the story.
The bigger question is: how does bacteria from a mouse actually make its way into the areas your family uses every day?
Could a Mouse Be Spreading Salmonella Around My Kitchen Without Me Knowing?
This is where the size of a mouse can be deceiving. It does not take up much space, but in a single night, it can move between hidden nesting areas, cabinets, pantries, countertops, and other areas throughout a home. And it does not leave everything behind when it moves.
Mice and other rodents can spread bacteria through their droppings, urine, saliva, and contaminated surfaces. That means the concern is not limited to wherever the mouse is hiding. It follows the paths the mouse takes through the home.
- Droppings where they travel. Mouse droppings can show up inside cabinets and drawers, along walls, behind appliances, and near stored food. If those droppings are carrying harmful bacteria, the area around them can become contaminated.
- Urine along their travel paths. Rodent urine is not always something a homeowner will immediately notice. A mouse can move through areas where food is stored or prepared and leave contamination behind without creating an obvious mess.
- Saliva around food and packaging. Mice gnaw to reach food. When you find a chewed cereal box, bag of snacks, or other food packaging, the concern is not only the missing food. The packaging and food inside may have been exposed to the mouse and its saliva.
- Contamination can travel with them. Think about where a mouse spends its time: nesting areas, wall voids, hidden spaces, and areas where waste may be present. Then think about where it can travel into the pantry, a cabinet, or the kitchen counter. That movement is what creates opportunities for contamination to spread beyond the place where the mouse is nesting.
And that is what makes mouse activity so easy to underestimate. The mouse you see for a few seconds is only one piece of what may be happening throughout the home.
Could You Get Sick From Mouse Contamination and Never Connect the Two?
Yes, here is where the connection becomes easy to miss.
Imagine waking up with stomach cramps, diarrhea, nausea, or a fever. What would you blame first? Dinner from the night before? Something you ate at a restaurant? A stomach bug going around?
The mouse living behind your kitchen cabinets probably would not be your first thought.
Salmonella symptoms can begin anywhere from 6 hours to 6 days after infection, and they can look a lot like other gastrointestinal illnesses. That gap between exposure and symptoms can make tracing an illness back to its source difficult.
And remember what was happening in the kitchen earlier in our story. The mouse did not need to get into your dinner. If bacteria are present, contamination can happen when a mouse or its waste comes into contact with food, packaging, utensils, or surfaces, and Salmonella can infect a person when the bacteria eventually make their way into the mouth.
That is why seeing a mouse is only part of the picture. What matters just as much is understanding where it has been, what it may have contacted, and whether there are signs of a larger rodent problem inside the home. And while Salmonella can affect anyone, the risk of serious illness is not the same for everyone.
Who in Your Home Is Most at Risk From Salmonella?
Not everyone in the home faces the same level of risk. Think about who lives under your roof. A young child grabbing a snack from the pantry. A grandparent visiting for the weekend. Someone who is pregnant or has a weakened immune system. The same Salmonella exposure that one person recovers from can be much more serious for someone else.
Children under 5, adults 65 and older, pregnant women, and people with weakened immune systems are among those at greater risk of developing a more serious Salmonella infection.
For many people, salmonellosis lasts several days and resolves without treatment. But in more serious cases, severe diarrhea can lead to dehydration and hospitalization. Salmonella can also move beyond the intestines and enter the bloodstream, allowing the infection to spread to other areas of the body.
That is why, when we investigate mouse activity, we are not only thinking about the mouse someone saw run across the floor.
We are thinking about the home around it. Where has the activity been happening? Where is food being stored? Are there droppings near living spaces? Where are the mice getting inside? And most importantly, what needs to be addressed to help protect the people living there? Because when mice are sharing your home, understanding the full picture matters.
And here in Central Indiana, there are several reasons homes can become especially inviting to mice as the seasons change.
Why Do Mice Keep Finding Their Way Into Central Indiana Homes?
If you live in Central Indiana, mice are not just a winter problem.
House mice can live and breed around structures throughout the year, but seasonal changes can make the warmth, shelter, food, and nesting opportunities inside a home especially valuable. Once a mouse finds a reliable way inside, it has little reason to leave.
And Central Indiana gives mice plenty of places to start.
Homes here sit alongside agricultural land, wooded areas, neighborhoods with mature landscaping, garages, sheds, crawl spaces, and other environments where mice can find food and shelter. Purdue Extension identifies the house mouse as the most common rodent pest found in structures, and mice are just as capable of settling into a newer home as they are an older one.
That is something our team at The LadyBug sees firsthand while investigating homes across Central Indiana.
The entry point is not always where the homeowner expects it to be. We look around utility penetrations, foundations, crawl spaces, garage doors, vents, rooflines, and other vulnerable areas of the structure. Remember the opening of this blog: a mouse only needs about a quarter-inch opening to get inside.
Finding the mouse is one thing. Finding how it got there is what starts changing the story. And sometimes, the clues are already sitting around the house; you just have to know what you are looking for.
What Are the Signs Mice Are Already Living in Your Home?
A mouse running across the floor is an obvious sign. But most of the time, the evidence starts showing up before the mouse does.
You open the cabinet under the sink and notice a few small, dark droppings in the corner. A bag in the pantry suddenly has a tiny hole chewed through it. At night, you hear scratching somewhere behind the wall, but by morning, the house is quiet again. Those little clues matter.
When our technicians investigate mouse activity in Central Indiana homes, we are not only looking for the mouse itself. We are looking for the evidence it leaves behind and where that evidence leads us.
- Droppings. Small, dark, rice-shaped droppings may appear inside cabinets and drawers, behind appliances, along walls, or near food-storage areas.
- Gnaw marks. Mice gnaw on food packaging, wood, insulation, and other materials around a home. They can also damage electrical wiring, which adds another concern beyond contamination.
- Grease or rub marks. Mice tend to travel familiar paths. Over time, contact from their fur can leave dark or greasy-looking marks along frequently traveled areas.
- Nesting material. Shredded paper, fabric, and other soft materials tucked into hidden areas can indicate a nesting site nearby.
- Unexplained odors. A persistent musky odor can develop when mouse activity has been present for an extended period, particularly around nesting areas.
- Sounds after the house gets quiet. Scratching, gnawing, or rustling coming from walls, ceilings, cabinets, or other hidden spaces can point to activity you cannot see.
One sign might tell you a mouse has been there. Multiple signs can begin telling us where it is traveling, where it may be nesting, and how it is using the home.
What Should You Do If You Find Evidence of Mice in Your Home?
Start with the droppings, but do not sweep or vacuum them dry. Doing so can cause potentially contaminated particles to become airborne. Thoroughly wet the droppings and surrounding area with an EPA-registered disinfectant or a freshly prepared bleach solution of 1 part bleach to 9 parts water before wiping them up. Soak for 5 minutes, then wipe with paper towels and seal them in a bag. Wear disposable gloves throughout and wash your hands after.
Then take these steps right away. You do not have to have all the answers before you call us. well help protect your household while we get there:
- Move all open food into hard-sided airtight containers
- Throw out any packaging a mouse may have chewed into or been near. Do not eat from it.
- Wash any dishes, utensils, or surfaces that may have been exposed with hot, soapy water, then disinfect.
- Check for gaps around pipes, utility lines, and the foundation. Seal small entry points with steel wool or caulk as a temporary measure.
- Schedule a rodent investigation, particularly if you have found droppings or heard activity in the walls.
Setting a trap can catch a mouse. It cannot tell you how it got in, whether there are more, where they are nesting, or what they have already contaminated, and those are the questions that determine whether the problem is actually resolved or just paused. That is what a rodent investigation with The LadyBug Pest & Wildlife Control is built to answer. A licensed technician goes through your entire home attic, crawl space, basement, garage, interior living areas, foundation, roofline, and every utility penetration looking for droppings, gnaw marks, nesting materials, chewed wiring, and every entry point, then delivers a written report of everything found. From there, exclusion seals those access points using industry-approved methods, and targeted control follows with tamper-resistant bait stations inside and out. It is a long-term plan, not a one-time visit, and we have been doing this right across Central Indiana for years.
If you want to get eyes on your home or just have questions, reach out to The LadyBug Pest & Wildlife Control or give us a call at 317-601-2873. We work across all of Central Indiana, and we are glad to help you figure out what you are dealing with.
