Cockroaches can cause serious health problems, including salmonella and gastroenteritis. More recently, cockroaches have been linked to a rise in cases of asthma.
Cockroaches secrete an oily liquid and excrement that has an offensive smell. It is commonly believed that cockroaches leave chemical trails in their excrement, which other cockroaches then follow to discover food, water and hiding places. The health risk posed by cockroaches in commercial food premises may also lead to compulsory closure orders.
Since cockroaches are nocturnal and have an aversion to light, infestations are not usually noticed until they are well established. It is therefore vital to contact a professional pest controller as soon as you identify an infestation.