Yes, rats can be harmful to humans in several ways, through disease transmission, property damage, and contamination, though the level of harm depends on exposure and whether the rats are wild or domesticated pets. Wild rats, including Norway rats and roof rats, can carry and spread diseases such as leptospirosis through urine-contaminated water, salmonella through droppings that contaminate food, hantavirus through airborne droppings, rat-bite fever through bites and scratches, and plague through fleas that rats carry, although modern plague cases are rare. Rats also bring in parasites like fleas, ticks, and mites that can bite humans and transmit other illnesses. Beyond disease, rats cause significant property damage by gnawing constantly on wood, plastic, drywall, and electrical wires to keep their teeth short, which can create fire hazards and costly repairs. They contaminate food supplies with droppings and urine, making food unsafe to eat. Their nesting can cause odor problems. Pet rats bred for companionship are much cleaner and pose far lower disease risk when kept in clean cages, but wild rats in homes should be removed promptly using safe methods, with protective gloves and mask during cleanup, disinfecting areas with bleach solution, and sealing entry points to prevent return.
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