Bed bugs are human parasites. They are crawling insects (cannot fly) but can be spread on clothing, luggage, furniture, books, mattresses and bed-linen etc. This way any household can be invaded by bed bugs.
As their name suggests they are usually found in bedrooms, where they hide close to where people sleep, in cracks and crevices in bed frames, furniture, behind skirting boards and wallpaper.
They are not thought to transmit any serious diseases to humans, but their blood feeding can cause severe irritation. The bites often produce hard white swellings which may distinguish them from the red marks usually associated with flea bites.
Bed bugs are by far one of the most difficult indoor pests to get rid of, and will usually require professional pest control treatment.