« The pathogens they carry include bacteria such as Clostridium difficile (C. diff), Salmonella, E. coli, and Leptospira. » Well, humans definitely carry at le

« The pathogens they carry include bacteria such as Clostridium difficile (C. diff), Salmonella, E. coli, and Leptospira. » Well, humans definitely carry at least three of those as well... « it is unclear how infectious the rats are to residents. » And yeah, that's the crux of it. We don't actually know if it's a problem!