Bedbugs are found all over the world. Bed bug infestations were common in the U.S. before World War II and became rare after widespread use of the insecticide DDT for pest control began in the 1940s and 1950s. They remained prevalent in other areas of the world and, in recent years, have been increasingly observed again in the U.S. Increases in immigration and travel from the developing world as well as restrictions on the use of stronger pesticides may be factors that have led to the relatively recent increase in bedbug infestations. While bedbug infestations are often reported to be found when sanitation conditions are poor or when birds or mammals (particularly bats) are nesting on or near a home, bedbugs can also live and thrive in clean environments. Crowded living quarters also facilitate the spread of bedbug infestations.

I'm a former scientist, using words and an audio recorder as my new research tools to untangle the health and food issues that matter most to consumers. I live in Brooklyn, N.Y., where I cook as much as possible. You can find me in the grocery aisle scrutinizing the fine print of every food item I put into my cart. Follow me on Twitter @juliacalderone.
Should I worry about a tick bite? Ticks are parasites that feed on blood, and although their bites are harmless they can still transmit diseases, such as Lyme disease or Rocky Mountain spotted fever. Learn what ticks are and how to recognize the signs and symptoms of a bite. This MNT Knowledge Center article also explains how to prevent tick bites. Read now
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