Bed bug fact sheet – King County, Washington

Bed bugs are small insects that feed on human blood. They are usually active at night when people are sleeping.

Adult bed bugs have flat, rusty-red colored oval bodies, no wings and are about the size of an apple seed. They are big enough to be easily seen, but hide in mattresses, box springs, bedding, cracks in furniture, floors, or walls. When bed bugs feed, they swell and become brighter red. They can live for several months to over a year without feeding. They don't jump or fly, and they crawl and move about the same speed as an ant.

Be aware that other insects, such as fleas, ticks, and mosquitos, can leave bites that look like bed bug bites. Bites alone cannot prove you have a bed bug infestation.

Important note: The only way to be sure you have a bed bug infestation is to find and positively identify a live bed bug.

If you suspect you have bed bugs, you will have to conduct a thorough search of your home. Bed bugs are hard to find because they hide in, under, and around beds. They also hide inside, under and behind furniture, and in small cracks or corners in furniture, floors or walls or in carpeting close to where they feed at night.

Newly hatched bed bugs are about the size of a poppy seed, pale yellow in color, almost transparent, and very difficult to see. Once they have fed, they become larger and are red or brown in color which makes them easier to see. Bed bug eggs are white and about the size of two grains of salt. When laid, they are cemented to surfaces making them difficult to remove.

A bed bug bite is painless and some people have no reaction to the bites at all. Most people have itchiness, red spots, or welts that look like mosquito or flea bites hours later. There may be an itchy bump but the tiny bite mark may not be visible. These usually fade after several days. A few people have severe allergic reactions.

Remember: Bites are only a clue that you may have bed bugs, but you can't tell from bites alone that you have a bed bug problem.

Bed bugs usually bite at night while you are asleep. If you wake up in the middle of the night and find a bug on your bed, don't squash it - instead, completely seal a live sample in a clean zip-style sandwich bag and have the bug identified by a pest control operator.

Bed bugs are not a result of poor housekeeping. Anyone can have bed bugs. People bring bed bugs into their homes unknowingly in infested luggage, backpacks, purses, furniture, bedding, shoes or clothing. They can also travel between apartments through cracks in walls and floors.

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Bed bug fact sheet - King County, Washington