House flies enter into homes and other buildings while they are looking for food and water- garbage, animal feces, leaky pipes or fixtures, and compost piles are all things that attract house flies to properties. They commonly enter into your home through torn screens, gaps around windows and doors, and any other small openings.
House flies are usually landing and feeding on garbage, feces and other less than desirable items before entering into your home. Because of this house flies can introduce a lot of dangerous diseases into your home and contaminate your food sources very quickly. Diseases that they transmit include but are not limited to typhoid fever, dysentery, cholera, tularemia, and tuberculosis.