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In page Bed bug:

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A definitive diagnosis of health effects due to bed bugs requires a search for and finding of the insect in the sleeping environment as symptoms are not sufficiently specific.[1] Bed bugs classically form a line of bites colloquially referred to as "breakfast, lunch, and dinner" and rarely feed in the armpit or behind the knee which may help differentiate it from other biting insects.[2] If the number in a house is large a pungent sweet odor may be described.[2] There are specially trained dogs that can detect this smell.[3]