Cockroaches spread human disease by depositing disease organisms on food and utensils. The American cockroach, which comes into contact with human excrement in sewers or with pet droppings, may transmit bacteria that cause Salmonella and Shigella. German cockroaches are believed to be capable of transmitting disease-causing organisms such as Staphylococcus, hepatitis, and coliform bacteria. They also have been implicated in the spread of typhoid and dysentery. Recent studies have found a strong association between the presence of cockroaches and increases in the severity of asthma symptoms in individuals who are sensitive to cockroach allergens.
Cockroaches may become pests in homes, restaurants, hospitals, warehouses, offices, and virtually any structure that has food preparation or storage areas. These pests are common even in the cleanest of crowded urban areas and older dwellings. It’s usually not difficult to discover an infestation, because they are often visible. Treatment usually involves sealing cracks and crevices to block entrance; keeping food and trash areas clean to avoid providing food; and the professional application of insecticide and bait on a regular basis.