Pest control is necessary because rodents and insects carry diseases, infest your kitchens and bedrooms, and bite you or your pets. The purpose of removing any kind of pest from your home, garage, or yard is to keep you safe and healthy. For example, rodents can leave feces on or near food they find in your kitchen. If you accidentally eat contaminated food, you can become very ill. Pests of all stripes carry tough viruses and bacteria that require long-term treatment. Others can make existing medical conditions like asthma even worse.