Dallas and Houston in the top 20

Houston — The Houston Chronicle is reporting; as most everyone knows by now, bedbugs are back. The exact cause is not known, but experts associate the resurgence with increased resistance of bed bugs to available pesticides, greater international and domestic travel.

To read what cities make the list: head to The Houston Chronicle's website: http://blog.chron.com/sciguy/2013/01/and-the-most-bedbug-infested-u-s-city-is/