The damage rodents cause is not limited to the food they eat. They contaminate many times what they consume, gnaw wires and insulation, and move through dirty places and then across food surfaces. Most importantly, some of the diseases associated with them are serious.
This is a specialized article within the rodent library, alongside Rats and Rodents.
Physical damage: gnawing wires, insulation, pipes and furniture, which can cause electrical faults.
Food contamination: rodents contaminate many times what they eat with their droppings, urine and hair.
Associated diseases: public health sources link them to diseases such as leptospirosis, salmonella and rat-bite fever.
Most at risk: young children, the elderly, people with weak immunity and pregnant women.
Best time to act: at the first sign, by cleaning carefully without a dry broom, then sealing entry points and starting a control plan.
Physical damage
Rodent teeth grow continuously, so they need to gnaw, which explains the amount of damage.
- Electrical wires: gnawing the insulation causes faults and short circuits and may lead to a fire.
- Pipes and insulation: damages thermal insulation and causes leaks.
- Furniture and doors: holes and scratches.
- Storerooms: spoiled food, packaging and bags.
Food contamination
- Droppings and urine: contaminate rice, grain and food containers.
- Hair and skin: shed from the fur.
- Quantities: a rodent spoils many times what it eats.
Associated diseases
Rodents do not carry every disease everywhere, but public health sources link them to several diseases, most of which spread through droppings and urine or through fleas and ticks.
- Leptospirosis: spread through rodent urine in water or soil.
- Salmonella: spread when food is contaminated with droppings.
- Rat-bite fever: spread through a bite or scratch.
- Hantavirus: linked to exposure to dust from droppings, and most common in certain parts of the world.
- Plague and murine typhus: linked to fleas carried by rodents; they are rare today but are historically documented.
Also see the article on bird mites and rodent mites if bites appear for no clear reason.
Allergy and respiratory health
- Rodent proteins: in urine and fur, they may trigger asthma and allergies.
- Contaminated dust: released into the air when sweeping dry.
How do you reduce the risk?
- Wear gloves and a mask when cleaning.
- Dampen droppings with a disinfectant before picking them up, and never sweep them dry.
- Wash contaminated surfaces and food containers.
- Treat the infestation with the removal plan and then prevention.
Diseases in brief: where do they come from?
- Direct exposure: touching droppings, a nest or a dead animal.
- Contaminated food: foods and containers that rodents have touched.
- Dust: dry dust from droppings when sweeping.
- Carrier insects: fleas, ticks and mites that live on rodents.
What do we throw away after an infestation?
- Open foods that they touched.
- Damaged insulation and nests.
- Droppings, after disinfecting them before picking them up.
- Gnawed wires should be rechecked before being switched on.
How are diseases transmitted?
Diseases pass from rodents in several ways: contact with urine, droppings or saliva, breathing contaminated dry dust, eating food they have touched, a bite, or through the fleas, ticks and mites they carry. Most cases are not the result of seeing a mouse, but of old dust in a storeroom or wrong cleaning of an infested area. That is why health authorities stress not sweeping dry droppings and sending them into the air.
Examples of rodent-associated diseases
- Salmonellosis: affects the digestive system through contaminated food and surfaces.
- Leptospirosis: spread through urine contaminating water, soil and wounds.
- Hantavirus: spread through contaminated dust in some parts of the world, and affects the respiratory system.
- Rat-bite fever: after a bite or scratch.
- Skin diseases transmitted by mites and fleas: for mites, see the dedicated article on bird and rodent mites.
These diseases vary by region and community, and having a mouse in your home does not mean it carries any of them, but caution is a must.
Economic damage
The damage is not only to health. Rodents spoil far more food than they eat, because they contaminate, gnaw and scatter. They damage insulation, wires, pipes, furniture and documents, and may cause fires through electrical short circuits. On farms they gnaw fruit, young plants and irrigation pipes.
Steps after discovering an infestation
- Keep children and pets away from the infested area.
- Wear gloves and a mask, and ventilate by opening doors and windows before cleaning.
- Spray a suitable disinfectant on the droppings and contaminated areas, and wait the time recommended on its package.
- Wipe with paper towels and dispose of them in a sealed bag.
- Wash your hands well after taking off the gloves.
- Start the rodent removal plan and seal the entry points to stop them coming back.
Children, the elderly and pregnant women
Some groups are more affected by infection or allergy: young children because they touch the ground and put their hands in their mouths, the elderly and people with weak immunity, and pregnant women. So it is advised to keep these groups away from cleaning areas, not to leave exposed food in infested places, and to consult a doctor if any symptoms appear after exposure.
Why is it not enough for rodents to "disappear"?
Even after the infestation ends, droppings, urine and nests stay contaminated for weeks. That is why we do not rely on traps alone; we clean, disinfect, seal entry points and follow up. A clean house with open entry points will receive new rodents, and a sealed house with contaminated leftovers remains a danger to its occupants.
How do you confirm the infestation is active?
- Fresh, soft, dark droppings that reappear after you remove them.
- Sounds of scratching or running at night in the ceiling or walls.
- New gnawing on bags, packages and wires.
- A pungent smell in enclosed places such as storerooms and lower cabinets.
- Greasy trail marks along the walls.
To learn the signs in detail, see the article on signs of rats and mice.
When should you call a specialist?
Visit your nearest Orkida branch with a photo or a sample if the infestation is in the ceiling or walls, involves large numbers, or if the home has young children, pregnant women or people with weak immunity. If fever or other symptoms appear after exposure to rodents or their droppings, consult a doctor and tell them about the exposure.
How do you protect wires, appliances and storerooms?
- Inspect exposed wires in drop ceilings, storerooms and behind appliances for signs of gnawing.
- Seal openings around pipes and cables with suitable materials that rodents cannot easily gnaw.
- Store food and feed in tight metal or thick plastic containers, not in paper or thin plastic bags.
- Lift boxes and goods off the floor and keep clear aisles between shelves and walls to make monitoring easier.
- Fix any leak or water source, because rodents need water.
How do you estimate the damage after discovering an infestation?
- Identify the areas where droppings and gnawing appeared and photograph them.
- Check wires and electrical wiring before running appliances in infested areas, and call an electrician if gnawing in the insulation is visible.
- Throw away exposed food that rodents touched, and do not rely on removing only the visible part.
- Clean and disinfect contaminated areas carefully as in the steps above.
Products from the Orkida store
We prefer locked stations and a plan that combines bait, traps and sealing entry points. We also advise following the dose on the package and placing bait away from children and pets.
- ProCatch Bait Station for Rats and Mice | English-made BULLET Model: a tamper-resistant locked bait station, where we place the bait away from children and pets, suitable for rats and mice along walls and passages.
- Catchmaster American Ready-to-Use Glue Traps for Mice and Crawling Insects | 72 Glue Boards: glue traps for monitoring and light infestations, useful indoors where bait is not wanted.
- Professional Rodent Control Package for the Home: a professional rodent package that combines bait, bait stations and monitoring equipment for the home and storeroom.
Frequently asked questions
Do all rodents carry diseases?
Not all of them are carriers, but you cannot tell, so safe handling is best.
Should I worry about my children?
The risk lies in contaminated food and surfaces and contact with droppings. Keep things clean and keep children away from infested areas.
What should I do if a mouse bites me?
Wash the wound thoroughly with soap and water and see a doctor.
Is cleaning with a vacuum or broom safe?
No, because it spreads contaminated dust. Use a disinfectant and paper towels, and keep your gloves on.
Do I need to see a doctor if I was not bitten?
If symptoms such as fever, diarrhea or shortness of breath appear after exposure to an infested area, see a doctor and tell them about the rodents.
Can rodents pass diseases to my pets?
They may pass parasites and bacteria, and pets may be exposed to poisons if they eat a dead rodent or bait, which is why we focus on locked stations.
How do I stop rodents from returning after cleaning?
Seal the openings around pipes and doors, keep food in airtight containers, and see the article on rodent prevention and the article on getting rid of rats and mice.
For the full picture, see the guide to rats and rodents, and browse the Pest Library for the rest of the guides.