Squirrels are known to carry numerous diseases, though only a few are dangerous to humans. Some of the more common include tularemia, typhus, plague, and ringworm. Such diseases are transmitted through bites or other forms of direct contact with infected squirrels. Tularemia, typhus, and plague have symptoms that mimic the flu and can be deadly when left untreated. While all mammals are capable of getting rabies, squirrels are very rarely rabid.
Other diseases squirrels transmit to humans come from the various parasites they carry. Rife with parasites such as fleas, ticks, and mites, squirrels living in proximity to homes frequently pass these tiny pests on to both humans and pets. Some of the diseases humans can get from the parasites include Lyme disease, Encephalitis, and Rocky Mountain spotted fever.
Many of these diseases are fatal when left untreated, so individuals should monitor for symptoms, and seek medical attention after coming in contact with squirrel urine or feces. Breathing in particles of the animal's excrement is the most common method of disease transmission. Squirrels can build nests in your attic, soffits and gutters that can contain all kinds of disease that can make you and your family very sick.
Keeping squirrels off your property and out of houses is the best way to ensure the health and safety of both homeowners and their pets. While screening and capping vents and chimneys is effective, entry points like windows, doors, and holes in the roof should also be properly sealed.