It's pretty clear that Chicago is on a roll this year when it comes to having annoying, biting, or bloodsucking pests in abundance (and in elected office). I'm just not sure that this is the kind of thing Chicago's tourism folks would want to brag about.
When your city is named "The Rattiest City In America" for the umpteenth consecutive time, you might start to look for creative solutions to your rodent problems.
We're not talking about rats who tell the Feds where the bribe money came from, or the inflatables that unions set up outside businesses that attract their ire.