Rats can absolutely make you sick, and they don’t need to bite you to do it. Wild rats carry bacteria, viruses, and parasites that spread to humans through urine, droppings, saliva, and contaminated food or water. Even breathing in dust from dried rat droppings in an enclosed space can transmit serious infections. The risks are real whether you’re dealing with a rat infestation at home, cleaning out a shed, or keeping a pet rat.
How Rats Spread Disease
Rats transmit illness through several routes, and direct contact with the animal is only one of them. Their urine and droppings contaminate surfaces, food, and water. When dried droppings are disturbed, tiny particles become airborne, and simply breathing them in can cause infection. Bacteria can also enter your body through broken skin, such as a cut or scrape that touches a contaminated surface.
The major diseases linked to rats include leptospirosis, hantavirus pulmonary syndrome, rat-bite fever, salmonella, tularemia, and lymphocytic choriomeningitis virus (LCMV). Rats carrying these pathogens often look perfectly healthy, so you can’t tell whether an animal is infectious just by looking at it.
Leptospirosis From Rat Urine
Leptospirosis is one of the most common rat-borne infections worldwide. The bacteria live in rat urine and survive in soil or water for weeks. You can get infected by wading through floodwater, touching contaminated soil with an open cut, or drinking water that rats have urinated in. You don’t need to see or touch a rat at all.
Symptoms start anywhere from two days to four weeks after exposure and initially look like a bad flu: high fever, chills, headache, muscle aches, nausea, vomiting, and sometimes jaundice (yellowing of the skin or eyes). Most people recover, but about 1% develop a severe form called Weil’s syndrome, which can cause kidney failure, internal bleeding, and difficulty breathing. That small percentage makes early treatment important if you suspect exposure.
Hantavirus From Dried Droppings
Hantavirus pulmonary syndrome is rarer than leptospirosis but far more dangerous. In Washington State, for example, one to five cases are reported each year, and roughly one-third of those are fatal. The virus spreads when you inhale dust contaminated with rodent urine, droppings, or saliva. This is why sweeping or vacuuming a space with rat droppings is so risky: it launches virus particles into the air.
Early symptoms appear within one to three weeks and include fever, chills, fatigue, and muscle aches concentrated in the thighs, hips, and back. The illness can seem to plateau or even improve before a second wave hits four to ten days later, bringing a dry cough, chest tightness, trouble breathing, and rapid heartbeat. At that point, the virus is damaging tiny blood vessels in the lungs and causing them to fill with fluid. If you develop sudden breathing difficulty after being around rodent droppings, that’s a medical emergency.
Rat-Bite Fever
Rat-bite fever is caused by bacteria that live naturally in rats’ mouths and noses. A bite or scratch is the most obvious route, but you can also pick it up from handling a rat or touching surfaces contaminated with its saliva. Up to 10% of rat bites may result in this infection.
Symptoms typically show up three to ten days after exposure: fever, headache, vomiting, muscle pain, joint pain, and a distinctive rash on the hands and feet. It’s treatable with antibiotics, but without treatment it can spread to the heart, brain, or lungs. If you develop a fever and rash after any contact with a rat, mention the exposure to your healthcare provider, because the symptoms alone can easily be mistaken for other illnesses.
Salmonella and Food Contamination
Rats don’t need to get into your food directly to contaminate it. They leave urine and droppings on countertops, pantry shelves, and food packaging as they travel. Salmonella bacteria shed in rat feces cause diarrhea, fever, and abdominal cramps, usually starting within 8 to 72 hours of exposure. Most healthy adults recover within a few days to a week without specific treatment, though diarrhea can last up to 10 days and it may take months for digestion to feel fully normal. Young children, older adults, and people with weakened immune systems face the highest risk of severe illness and dangerous dehydration.
Pet Rats vs. Wild Rats
Pet rats are far safer than wild ones, but they aren’t risk-free. Domestic rats bred in captivity have much less exposure to the pathogens that wild rats encounter in sewers, garbage, and soil. Still, pet rats can carry rat-bite fever bacteria as part of their normal mouth flora, and they can potentially transmit leptospirosis and salmonella. LCMV is another concern, particularly with rodents purchased from breeders or pet stores where animals are housed in close quarters.
The practical difference comes down to exposure level. A wild rat infestation means droppings and urine accumulating unseen in walls, attics, and crawlspaces, creating ongoing airborne and surface contamination. A pet rat in a clean cage, handled with basic hygiene like washing your hands afterward, poses a much smaller risk. Children under five, pregnant women, and anyone with a compromised immune system should be especially cautious around any rodent.
How to Safely Clean Up Rat Droppings
The way you clean up after rats matters as much as the cleanup itself. The single most important rule: never sweep or vacuum droppings. Sweeping launches dried particles into the air, which is exactly how hantavirus spreads.
Start by opening doors and windows for at least 30 minutes and leave the area while it airs out. When you return, wear rubber, latex, or vinyl gloves. Spray droppings and urine with a bleach solution (1 part bleach to 10 parts water) or a household disinfectant, and let it soak for at least five minutes. Then pick everything up with paper towels and throw them in the garbage. Disinfect any surfaces the droppings touched.
For heavy infestations in attics, basements, or crawlspaces, you need more protection: disposable coveralls, rubber boots, protective goggles, and a respirator with a HEPA filter. If the infestation is large enough to make you hesitate, hiring a professional cleanup service is a reasonable call.
Symptoms That Need Prompt Attention
Many rat-borne illnesses start with generic flu-like symptoms, which makes them easy to dismiss. The key is connecting those symptoms to a possible exposure. If you’ve recently cleaned a space with rodent droppings, been bitten or scratched by a rat, or live in an area with a known infestation, pay attention to fever, chills, muscle aches, headache, or nausea that develop in the following days or weeks.
Certain symptoms signal that the illness is progressing and needs urgent care: difficulty breathing, chest tightness, coughing up blood, severe jaundice, a sharp drop in urine output, or a rash with flat red or dark spots. With hantavirus in particular, the window between early flu-like symptoms and life-threatening lung involvement can be just a few days. Mentioning your rat exposure to a doctor early on helps them test for the right infections before things escalate.