Risk
They contaminate food and utensils with bacteria. Their droppings and shed skins are allergens that can worsen asthma, especially in children.
Where they appear
Kitchens, drains, fridge motors, grease traps and cardboard boxes.
Cockroaches
Insects of the order Blattodea. There are thousands of species, but in homes and businesses the usual ones are the American, German and Oriental cockroach.