Rats aren’t just annoying—they can actually carry some pretty serious diseases that put your health at risk. They spread illnesses like leptospirosis, hantavirus, salmonellosis, plague, and rat-bite fever through their droppings, urine, bites, and even the parasites they host. Knowing what diseases rats carry helps you stay safe and protect your home.
You might not realize just how easily these diseases can spread. Rats leave germs on surfaces and in the air, so even touching or breathing in contaminated dust can make you sick.
Awareness really does help you take the right steps to keep rats out and stay healthy.
Major Diseases Carried by Rats
Rats carry several diseases that can affect you if you come into contact with their urine, droppings, or bites. Some of these illnesses just feel like the flu, but others can get much worse.
Leptospirosis
Leptospirosis is a bacterial infection, and rats are a major source. You can get it if you touch water, soil, or food that’s been contaminated with rat urine.
It usually starts off with fever, headache, chills, and muscle aches. If you don’t treat it, leptospirosis might cause jaundice (that’s yellow skin or eyes), red eyes, or even kidney and liver issues.
It’s more common if you spend time in wet or flooded places where rats hang out. Try to wash your hands after being in areas where rats might have been, and avoid touching standing water that could be contaminated.
Hantavirus and Hantavirus Pulmonary Syndrome
Hantavirus mainly comes from deer mice, but some rats and other rodents can carry it too. You can get infected if you breathe in dust with rodent droppings, urine, or saliva.
Hantavirus can cause Hantavirus Pulmonary Syndrome (HPS), which is no joke. Early symptoms look like the flu—fever, muscle aches, and fatigue.
Later, it can suddenly cause severe breathing trouble, and you may need emergency care. If you clean up after rodents carefully and keep rats out of your home, you’ll lower your risk.
Salmonellosis
Salmonellosis is a bacterial infection you get when rats contaminate food or water with their droppings or urine. Rats often sneak into kitchens, pantries, or food storage areas.
Symptoms include diarrhea, fever, stomach cramps, and vomiting. Most people recover in about a week, but sometimes it can get serious and cause dehydration.
To avoid it, seal your food and clean up any rat droppings right away.
Rat-Bite Fever
Rat-bite fever comes from bacteria in rats’ mouths and bodies. Usually, it spreads if a rat bites or scratches you, or if their urine or droppings get into cuts or sores.
Symptoms usually show up within a week—fever, rash, headache, vomiting, and muscle pain. If you don’t treat it, rat-bite fever can lead to serious problems like joint infections or heart issues.
If a rat bites you, clean the wound well and see a doctor.
Other Serious Rodent-Borne Illnesses and Transmission
If you’re dealing with a rat infestation, it’s good to know which illnesses they can spread. Rats transmit some pretty nasty diseases through their droppings, urine, bites, or just by being around. Spotting the signs of an infestation early and acting fast really matters.
Plague and Bubonic Plague
Plague is a dangerous disease that rats can carry, mostly through fleas living on them. Bubonic plague causes swollen lymph nodes, fever, chills, weakness, and sometimes even skin tissue death.
It’s rare these days, but cases still pop up in certain areas, especially in the Western U.S. Rats carrying plague might not look sick, but if you see gnaw marks or droppings, it’s time to worry.
Fleas from these rats can bite you and pass on the plague bacteria. If you have a rodent problem, you really should call pest control or a rodent exterminator.
Tularemia
Tularemia is another bacterial disease that rats and other rodents can spread. You might catch it from rat urine, feces, or bites.
Tularemia can cause fever, swollen lymph nodes, skin ulcers, chest pain, and inflammation. Rats leave droppings and urine that carry the bacteria.
Touching contaminated surfaces or breathing in dust from dried feces can infect you. To cut your risk, seal up entry points, store food securely, and clean up any rodent mess carefully.
Lymphocytic Choriomeningitis Virus (LCMV)
LCMV is a virus you mostly get from house mice, but rats can carry it too. You can catch it from rodent urine, droppings, or saliva.
It usually causes flu-like symptoms—fever, headaches, muscle aches, and sometimes swelling of the brain or spinal cord. Since rats and mice might not show any signs, it’s smart to catch infestations early.
Don’t handle rodents directly, and always wear gloves when cleaning up droppings or nests. If you’re not sure what to do, calling a professional exterminator is a good idea.
How Rats Transmit Diseases to Humans
Rats spread diseases in two main ways: direct contact and indirect contact.
If you touch rat urine, feces, or saliva, or if a rat bites you, you can get sick through direct transmission.
Indirect transmission? That happens when fleas, ticks, or mites leave the rat and bite you, bringing diseases along for the ride.
At night, rats get busy and leave urine and droppings pretty much everywhere they wander.
If you notice gnaw marks or droppings, those are big red flags. Honestly, you should act quickly.
Try to keep your home clean, seal up any holes bigger than half an inch, and stash your food properly.
If you see any signs of rats, it’s smart to reach out to a rodent control expert.
They know how to get rid of infestations and help keep your family safer from disease.
