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Cockroaches can be found all over the world. Currently, there are over 3,500 species of cockroaches roaming the country. American cockroaches are bigger and black. The German cockroach is smaller and brown. While Asian cockroaches are medium and dark brown to black. Because these insects eat a variety of foods, including rotting garbage, then they are believed to spread the disease in humans, including salmonella and gastroenteritis