When we moved, we discovered we had a feral dog padding around our land. She went and had six puppies and increasing amounts of poop meant we got the local SPCA to catch them all and get them proper homes. Now we have rats, so I guess I know why the pups looked so well fed. Aaaanyway, long story short, to reiterate civilservant's question, given that the lack of urban waste, toxins etc, are clean rats still disease bearing or are they no more troublesome than squirrels (rats with good PR)?