As a city dweller, believe me, I know. There are few things more disgusting than rats. I've dealt with rats in my parking garage where, much to our horror, we found evidence of rats rummaging around our Ford Taurus. When there was construction on my street, I was afraid to use the sidewalk at night for about six months one year for fear of having a furry rodent scurry across my shoes. Most recently, a soup kitchen and food pantry near my home suffered a rat infestation and had to shut down to clear the beasts out.

Rats are a fact of life in the city. As horrifying as each of these incidents were, they were eventually brought under control. The truth is, rats, cockroaches and other vermin can be controlled. And in a well-managed business or building, they should never get out of control.

That's why the recent, much-publicized rat infestation in a Greenwich Village KFC/Taco Bell (the restaurant chain is a division of Yum! Brands, Inc. (NYSE:YUM)) was so shocking. There probably are a few rats scurrying around in the sub-basements of many buildings in the city. But these rats were able to make it upstairs, in broad daylight. And so many of them! Some reports put the tally at dozens scurrying around.

For business owners, there are lots of lessons in this sorry tale. Here are a few of them -- followed by some rat-related information that may prove useful if you ever have to fight a rat infestation yourself:

Ignore a problem and it's bound to get bigger. As Michael Fowlkes wrote on BloggingStocks, the company initially deemed this a "temporary escalation" of what was previously understood to be a more ordinary rat problem.