Yes. According to the Centers for Disease Control and Prevention (CDC), rodents have the potential to directly transmit several diseases including Hantavirus Pulmonary Syndrome, Leptospirosis, rat-bite fever, and Salmonellosis. They also introduce ticks, mites, and fleas onto properties. While Washington has very few cases of Lyme disease and other tick-borne diseases, the link between rodents and ticks should be noted.