Prior to World War I, nearly 30 percent of all homes were infested with bed bugs. Widespread use of pesticides such as DDT all but eradicated bed bugs for nearly 50 years. But with declining use of pesticides and the elimination of DDT, bed bugs have staged a comeback and are reported in all 50 states. There is even an iPhone app that allows users to track bed bug sightings. Dr. Jeffrey Levin of the U.T. Health Science Center at Tyler discusses bed bugs in this post to the U.T. Health Science Center at Tyler’s YouTube Channel.