Some people might not think very high of them, but if these pests go into the food can trigger major illnesses due to the germs they leave on the trail. Flies, for example, can't eat strong food. So once they land on the food, they vomit onto it and then stamp on the vomit to help to make food gooey. Once the food is gentle enough to pull, they eat it and leave their feces all over the food
Rats and mice access buildings, offices and homes via little holes or spaces in walls and roof. If they roam they can urinate in your ceiling and wall cavities and can chew through electrical cables which could cause fires. Rats and mice happen to be a persistent issue to humans since people learned to store seeds along with other foods. Many disease microorganisms are carried through rodents and spread with the rodent's constant out of control urination and excrement.
Preventing access is essential to stop pests from arriving in your home. There's no satisfaction in eliminating pests if their cousins may come in anytime in your house, right? Should you live in a classic house, repairs should be done as quickly as possible to prevent access and also to eliminate potential reproduction sites. During summer time, install wire nylon uppers on windows along with other possible entry spots to avoid pest from arriving inside.