Over 60 Human Diseases Are Associated With Rodents
Rats and mice aren't just a nuisance. They are documented carriers of serious, sometimes fatal, diseases — many of which can be transmitted without direct contact.
Most homeowners think of a rat problem as a structural issue — chewed wires, contaminated insulation, noise at night. That's accurate. But it's only part of the picture.
The Centers for Disease Control and Prevention (CDC) has documented over 60 diseases that can be transmitted to humans directly or indirectly through rodents. Some are rare. Others are not. All of them are preventable — and the most effective prevention is keeping rodents out of your home entirely.
Diseases Transmitted Directly by Rodents
Direct transmission occurs through contact with rodent urine, droppings, saliva, or bites — or by breathing in dust contaminated with rodent waste.
Hantavirus Pulmonary Syndrome
SevereTransmission: Inhaling dust from infected rodent urine or droppings
Mortality rate of 38%. Found in deer mice. Attic and crawlspace disturbance is a primary exposure risk.
Leptospirosis
SeriousTransmission: Contact with water or soil contaminated by rodent urine
Can cause kidney damage, liver failure, and meningitis. Spread through standing water, flooding, or direct contact.
Rat-Bite Fever
SeriousTransmission: Bite or scratch from infected rat, or contact with contaminated food or water
Caused by Streptobacillus moniliformis. Can be fatal if untreated. Symptoms include fever, rash, and joint pain.
Salmonellosis
ModerateTransmission: Consuming food or water contaminated with rodent feces
One of the most common foodborne illnesses. Rodents contaminate food preparation surfaces and stored food.
Plague
SevereTransmission: Bite from infected flea carried by rodents
Caused by Yersinia pestis. Still present in the western United States. Historically the cause of the Black Death.
Tularemia
SeriousTransmission: Contact with infected rodent tissue, or bite from infected tick or fly
Also called rabbit fever. Can be contracted by handling infected animals or inhaling contaminated dust.
Lymphocytic Choriomeningitis (LCM)
SeriousTransmission: Exposure to fresh urine, droppings, saliva, or nesting material of infected rodents
Carried primarily by house mice. Can cause neurological disease. Particularly dangerous during pregnancy.
Hemorrhagic Fever with Renal Syndrome
SevereTransmission: Inhaling or contacting infected rodent urine, droppings, or saliva
Caused by hantaviruses. Primarily found in Asia and Europe but related strains exist in North America.
Diseases Transmitted Indirectly Through Rodents
Indirect transmission occurs through fleas, ticks, or mites that feed on infected rodents and then bite humans.
Murine Typhus
ModerateTransmission: Bite from infected flea carried by rats
Common in areas with high rat populations. Causes fever, headache, and rash. Treatable with antibiotics.
Lyme Disease
SeriousTransmission: Bite from infected tick that fed on rodents
Rodents are a primary reservoir host for the bacteria that causes Lyme disease.
Rocky Mountain Spotted Fever
SevereTransmission: Bite from infected tick associated with rodents
Can be fatal within days if untreated. Rodents serve as reservoir hosts for the tick vector.
Cutaneous Leishmaniasis
ModerateTransmission: Bite from infected sandfly that fed on rodents
Rodents are reservoir hosts. Causes skin lesions and can progress to systemic disease.
Why Attic and Crawlspace Infestations Are Especially Dangerous
The most significant disease exposure risk from a home rodent infestation isn't a bite — it's disturbing contaminated material. When rodents nest in an attic or crawlspace for months or years, they leave behind concentrated deposits of urine, droppings, and nesting debris.
When that material is disturbed — during a home inspection, an HVAC repair, or an attic cleanout — it becomes airborne. Hantavirus, LCM, and other pathogens can be inhaled in the process. This is why professional remediation with proper respiratory protection is not optional when significant contamination is present.
In Memphis and the surrounding area, roof rats are the primary species found in attics. They are prolific nesters and can contaminate large areas of insulation over a single season.
The Only Reliable Prevention Is Exclusion
Rodenticides reduce populations temporarily. They do not prevent new rodents from entering through the same gaps. As long as entry points exist, the disease risk continues.
Physical exclusion — sealing every entry point a rodent can use to access your home — is the only method that eliminates the risk at the source. Combined with removal of the existing population and remediation of contaminated material, it produces a permanent result.
Don't Wait Until There's a Health Risk
If you're hearing activity in your attic or finding evidence of rodents in your crawlspace, call us. We'll inspect the structure, identify every entry point, and give you a straight assessment of what it takes to solve the problem.