A rat in the house is more than a nuisance and a chewing hazard. It is a real health concern. The risk is manageable once you understand it.
What rats can spread
Rats are associated with several illnesses, passed on through their urine, droppings, saliva and by contaminating food and surfaces:
- Leptospirosis: bacteria in rat urine, especially a concern in monsoon and around standing water.
- Salmonellosis: food poisoning from contaminated food or surfaces.
- Hantavirus: spread through disturbed droppings and urine.
- Rat-bite fever: from bites or scratches.
The allergy and asthma angle
Beyond infections, rat hair, droppings and nesting material can trigger or worsen asthma and allergies, a quieter but common effect of an indoor rodent problem.
Clean up safely
Never sweep or vacuum dry droppings, because it can send particles into the air. Wear gloves and a mask, dampen the area first, wipe with disinfectant, and bag the waste. Ventilate the room.
Leptospirosis and the Indian monsoon
Of the rat-linked illnesses, leptospirosis is the one Indian cities see most often, and it peaks in the monsoon. The bacteria live in the urine of infected animals, especially rats, and survive in water and wet soil. When streets flood, people walking through the water can be infected through cuts, scratches or the eyes and mouth.
Health departments in flood-prone cities such as Mumbai issue warnings every rainy season for this reason. If you have waded through floodwater and then develop a fever, headache, body ache (often in the calves) or red eyes, see a doctor promptly and tell them about the floodwater. Leptospirosis is treatable, and early treatment matters.
Who is most at risk
- Young children: they play on floors and put their hands in their mouths.
- Older people and anyone with a weakened immune system.
- People with asthma or allergies: droppings and nesting material can worsen symptoms.
- Anyone who cleans up after rats without protection: gloves and a mask matter.
Food that rats have touched
If a rat has gnawed a packet or you find droppings in a cupboard, throw away any open or damaged food in that area, washing it is not enough. Food in sealed glass or metal containers is fine once the outside is cleaned. Wash utensils and wipe shelves with a disinfectant before restocking. See the real reason rats love kitchens for keeping them away from food in the first place.
If you are bitten or scratched
- Wash the wound well with soap and running water for several minutes.
- Apply an antiseptic and cover it with a clean dressing.
- See a doctor the same day, rat bites can cause infection, and your doctor will decide on any tetanus shot or antibiotics.
- Watch for fever, rash or joint pain in the following days, and go back if they appear.
A safe clean-up checklist
- Air the room out for 30 minutes before you start.
- Wear rubber gloves and a well-fitting mask.
- Spray droppings and urine stains with disinfectant (or a dilute bleach solution) and let it soak for a few minutes.
- Wipe up with paper towels, bag everything, and seal the bag before throwing it out.
- Disinfect the surface again, then wash your gloves before taking them off, and wash your hands afterwards.
This article is general information, not medical advice. If you feel unwell after contact with rats or their droppings, consult a doctor.
The best protection is keeping them out
Reducing the health risk comes down to denying rats a reason to be indoors: seal food, fix leaks, close gaps larger than 2 cm, and keep problem areas unwelcoming. The EchoRepel Ultrasonic Rat Repellent does that last part without poison, safe to run around children and pets, while you handle the cleanliness and sealing. For finding where they hide, see 9 surprising places rats hide in your home.