Cockroaches create an unsanitary situation and can pose various health threats to humans. Eating food contaminated by cockroaches may cause food poisoning, meanwhile cockroach faeces can also negatively affect the health of humans, particularly for people with asthma. They can also spread harmful bacteria, including coliform, salmonella, staphylococcus, and streptococcus, by crawling through garbage and sewers to kitchen countertops. But once these pests have entered your home, it can be almost impossible to eliminate them. Cockroaches can survive for weeks without food and water. Their eggs are also protected from insecticide by the egg case, so even if you kill the adults, they’ll soon be replaced by newborns. The only way to eradicate a cockroach invasion is with a professional pest control service.