Rats in your home aren't just a nuisance — they're a health hazard. Rodents carry and transmit multiple diseases that can affect humans and pets. In South Florida's warm, humid climate, the risk is year-round. Here's what you need to know about the diseases rats carry and why proper cleanup and sanitization matters.
Leptospirosis
Leptospirosis is a bacterial infection spread through rat urine. In Miami, where heavy rainfall is common, the bacteria can contaminate standing water, soil, and surfaces. Humans can become infected through contact with contaminated water or soil — especially through cuts or mucous membranes.
Symptoms include high fever, severe headache, muscle aches, vomiting, and jaundice. Severe cases can cause kidney failure, liver failure, and meningitis. Miami-Dade has seen documented leptospirosis cases linked to rodent exposure, particularly after flooding events.
Salmonellosis
Rats contaminate food and surfaces with salmonella bacteria through their droppings. If a rat walks across your kitchen counter, pantry shelves, or stored food, it can leave salmonella behind. Symptoms include diarrhea, fever, and abdominal cramps that typically last 4 to 7 days.
This is why finding droppings in your kitchen or pantry is a serious concern — not just evidence of rats, but a direct health risk.
Hantavirus
Hantavirus is transmitted through inhalation of dust contaminated with rat droppings, urine, or nesting materials. This is particularly relevant during attic cleanups or when disturbing areas where rats have been nesting. Hantavirus Pulmonary Syndrome (HPS) is rare but serious — it can be fatal.
This is exactly why DIY attic cleanup after a rat infestation is dangerous. Sweeping or vacuuming rat droppings without proper protective equipment can aerosolize the virus. Professional attic sanitization uses HEPA filtration, protective gear, and proper containment protocols.
Rat Bite Fever
Caused by bacteria Streptobacillus moniliformis, rat bite fever can be transmitted through bites, scratches, or contact with a dead rat. Symptoms include fever, rash, vomiting, and joint pain. Left untreated, it can cause serious complications including endocarditis (infection of the heart valves).
Plague
While plague is extremely rare in Florida, rats and their fleas are the historical vector. The risk is low but worth noting in the context of why rodent control matters from a public health perspective.
Parasites
Rats carry fleas, ticks, and mites that can infest your home and affect pets and humans:
- Rat fleas — can bite humans and pets, causing itching and potential allergic reactions
- Rat mites — when rats die or leave a nest, mites seek new hosts, including humans. Bites cause intense itching.
- Ticks — rats can introduce ticks to your home and yard
When rats die from poison inside your walls, their fleas and mites disperse into your living spaces looking for new hosts. This is another reason poison creates more problems than it solves.
Allergies and Asthma
Rat dander, droppings, and urine are known allergens. In homes with active infestations — especially when rats are in the attic near HVAC systems — allergens can circulate through your air conditioning. Studies have linked rodent allergen exposure to increased asthma symptoms in children, which is particularly concerning in Miami's dense residential neighborhoods.
Why Cleanup Matters
Killing or removing the rats is only half the job. The contamination they leave behind — droppings, urine, nesting materials, parasites — remains a health hazard until it's properly removed and the space is sanitized.
Professional attic cleanup includes:
- Removal of contaminated insulation
- HEPA vacuuming of droppings and debris
- Antimicrobial treatment of affected surfaces
- Replacement of insulation
- Sealing of any remaining gaps (as part of exclusion)
Don't attempt cleanup yourself without proper protective equipment. The health risks from improper handling of rodent waste are real and documented.
Protect Your Family
If you have rats — or had rats — in your Miami home, the health risk doesn't end when the scratching stops. Contamination persists until it's professionally addressed. Contact us for a free inspection that includes an assessment of contamination and a cleanup plan.
Call (305) 555-0147.