I had a rat problem recently and it terrified me, mainly because of all the <a href="http://www.localpestcontrolservices.com/pest_control_blog/arizona-pest-control/rats_roof_rats_diseases/">diseases they carry</a>. Knowing that rats can spread diseases from their waste and that they were in my house really freaked me out. After the exterminator came I thoroughly scrubbed and cleaned every inch of my house, just in case.