Many of the survival requirements of cockroaches can be found in a typical home. These include warmth, high humidity and food and water sources. Cockroaches evolved as scavengers of decaying plant materials and will therefore readily feed on carbohydrates and a variety of other man made substances including paints, wallpaper pastes, and even book bindings. Homes also provide shelter to cockroaches and a multitude of warm and humid nooks and crannies where they can rest and nest.
Cockroaches carry and can spread more than 40 varieties of bacteria, germs, parasitic worms and other human pathogens. They easily transmit many different germs from crawling across unsanitary areas like bathroom floors, rodent nesting areas and even sewage, rotting food and garbage.