Rats and mice carry diseases that can be transmitted to humans through direct contact, contaminated food, and airborne particles. Rodent-borne diseases range from mild flu-like symptoms to life-threatening conditions.
Understanding the risks , and how to protect yourself , is essential for anyone dealing with a rodent infestation. This guide covers the most common diseases carried by rats and mice in North America.
Key Takeaways
- Hantavirus: Carried by deer mice. Causes Hantavirus Pulmonary Syndrome (HPS). Fatality rate 38%. No specific treatment.
- Leptospirosis: Carried by rats. Bacterial infection transmitted through urine. Causes fever, kidney damage, liver failure.
- Salmonellosis: Carried by mice and rats. Food poisoning from contaminated food. Common but rarely severe.
- Plague: Carried by rats and their fleas. Rare in the US but still present in the Southwest. 10-15% fatality rate.
- Rat-bite fever: Carried by rats. Transmitted through bites, scratches, or contact with dead rats. Treatable with antibiotics.
Hantavirus (Hantavirus Pulmonary Syndrome)
Hantavirus is the most serious rodent-borne disease in North America. It is carried primarily by the deer mouse (Peromyscus maniculatus) and is transmitted through inhaling aerosolized virus particles from dried rodent urine, droppings, or nesting materials.
HPS has a fatality rate of approximately 38% and there is no specific treatment or cure.
Early symptoms include fatigue, fever, and muscle aches, progressing to coughing and shortness of breath within 4-10 days. HPS requires immediate hospitalization. Prevention is the only defense: never sweep or vacuum rodent droppings, always wet-clean with disinfectant, and wear an N95 respirator.
Leptospirosis
Leptospirosis is caused by Leptospira bacteria, which are shed in rat urine. Humans become infected through contact with water, soil, or food contaminated with infected urine. The bacteria enter the body through cuts, abrasions, or mucous membranes.
Symptoms range from mild flu-like illness to severe kidney and liver damage. Leptospirosis is treatable with antibiotics, but early diagnosis is critical.
Salmonellosis
Mice and rats can carry Salmonella bacteria in their digestive tracts. Contamination of food, kitchen surfaces, and food storage areas is the primary transmission route. Symptoms include diarrhea, fever, and abdominal cramps lasting 4-7 days.
Most healthy adults recover without treatment, but salmonellosis can be severe in children, the elderly, and immunocompromised individuals.
Plague
Bubonic plague is caused by Yersinia pestis, a bacterium carried by rats and transmitted by rat fleas. While rare in the United States, an average of 7 cases are reported annually, primarily in the Southwest. Modern antibiotics are effective when treatment begins early.
Preventing flea exposure is the best protection.
Rat-Bite Fever
Rat-bite fever is caused by Streptobacillus moniliformis, a bacterium found in the mouths and respiratory tracts of rats. It is transmitted through bites, scratches, or handling dead rats. Symptoms include fever, rash, and joint pain, typically appearing 3-10 days after exposure.
Rat-bite fever is treatable with antibiotics.
Health Warning
If you experience flu-like symptoms within 1-5 weeks of cleaning a rodent-infested area, seek medical attention immediately. Tell your doctor about your rodent exposure. Early treatment is critical for all rodent-borne diseases, especially hantavirus.
Frequently Asked Questions
How do I clean rodent droppings safely?
Spray with a bleach solution (1 part bleach to 9 parts water), let sit for 5 minutes, wipe with paper towels. Wear gloves and an N95 respirator. Never vacuum or sweep dry droppings.
Can I get hantavirus from live mice?
The risk is highest when cleaning areas with dried droppings and urine. Live mice present a lower risk, but avoid handling them directly. Use traps and dispose of dead mice with gloves.
How long does hantavirus survive in droppings?
Hantavirus can remain infectious in dried droppings for days to weeks. The virus is inactivated by sunlight, heat, and disinfectants.
Should I see a doctor after finding rodent droppings?
If you cleaned droppings without proper protection and develop flu-like symptoms within 6 weeks, see a doctor and mention your rodent exposure.
Related Resources
? Rat vs Mouse Droppings ID · ? How to Get Rid of Mice · ? Rodent-Proofing Your Home · ? How to Get Rid of Rats in Yard
Why Trust Us
WildAnimalsCentral.com relies on the Centers for Disease Control and Prevention (CDC), the World Health Organization (WHO), and peer-reviewed medical journals for disease information.
Our health content is reviewed by medical professionals and updated annually to reflect the latest research and treatment guidelines.
